Methods of inducing responsiveness to anti-angiogenic agent

ABSTRACT

The invention provides methods of inducing or improving responsiveness to a VEGF antagonist to a subject or a subject population comprising administering an adenovirus comprising a nucleic acid construct comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter and administering the VEGF antagonist.

BACKGROUND OF THE DISCLOSURE

Angiogenesis is a common and major feature of several pathologies. Among these are diseases in which the angiogenesis can improve the disease condition (such as ischemic heart disease) and diseases in which the excessive angiogenesis is a part of the pathology and thus should be eliminated. These latter diseases include diabetes (diabetic retinopathy), cardiovascular diseases (atherosclerosis), chronic inflammation (rheumatoid arthritis), and cancer. Angiogenesis occurs in tumors and permits their growth, invasion and metastasis. In 1971, Folkman proposed that tumor growth and metastases are angiogenesis dependent, and thus inhibiting angiogenesis may be a strategy to arrest tumor growth.

There are several molecules involved in angiogenesis, from transcription factors to growth factors. Hypoxia is an important environmental factor that leads to neovascularization, and it induces release of several cytokines release that are pro-angiogenic factors. Among them are vascular endothelial growth factors (VEGF) and their receptors, members of the angiopoietin family, basic fibroblast growth factor, and endothelin-1 (ET-1). These factors are involved in induction of angiogenesis through activation, proliferation and migration of endothelial cells.

Recombinant forms of endogenous inhibitors of angiogenesis were tested for the treatment of cancer. The potential pharmacokinetic, biotechnological and economic drawbacks of chronic delivery of these recombinant inhibitors have led scientists to develop other approaches.

The development of the anti-VEGF monoclonal antibody bevacizumab has validated an antiangiogenic approach as a complementary therapeutic modality to chemotherapy. Several small molecule inhibitors, including second-generation multi-targeted tyrosine kinase inhibitors, have also shown promise as antiangiogenic agents for cancer.

However, the potential pharmacokinetic and economic drawbacks of chronic delivery of recombinant inhibitors, antibodies, and small molecules, as well as the limited activity manifested when applied as monotherapy have led scientists to evaluate antiangiogenic gene therapy. Gene therapy is an emerging modality for treating inherited and acquired human diseases. However, there are a number of obstacles limiting successful gene therapy, including duration of expression, induction of the immune response, cytotoxicity of the vectors and tissue specificity. Two general strategies for the cancer gene therapy were proposed: tumor directed or systemic gene therapy. The lack of success in targeting gene therapy products to cancerous cells or their environment by systemic treatments caused most therapies to be administered to the tumor itself.

BRIEF SUMMARY OF DISCLOSURE

The present invention is directed to a method for inducing or improving responsiveness to a vascular endothelial growth factor (VEGF) antagonist in a subject in need thereof, comprising administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, and the VEGF antagonist to the subject, wherein the responsiveness to the VEGF antagonist is induced or improved after the administration of the vector compared to the responsiveness to the VEGF antagonist without the administration of the vector. The invention is further directed to a method for inducing or improving responsiveness to a VEGF antagonist in a subject population in need thereof, comprising administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter and the VEGF antagonist to the subject, wherein the responsiveness to the VEGF antagonist is induced or improved after the administration of the vector compared to the responsiveness to the VEGF antagonist without the administration of the vector.

In one aspect, the subject or the subject population is in need of inducing or improving responsiveness to a VEGF antagonist. In one embodiment, the responsiveness to the VEGF antagonist is an anti-angiogenesis property of the VEGF antagonist. In another embodiment, the responsiveness to the VEGF antagonist is an anti-tumor effect of the VEGF antagonist.

In another aspect, the VEGF antagonist is an anti-VEGF antibody or a VEGF binding molecule. In one aspect of the present invention, the VEGF antagonist is bevacizumab.

In some aspects, the vector comprising a Fas-chimera gene encodes a polypeptide comprising an extracellular domain of a TNF Receptor 1 (TNFR1) polypeptide fused to a transmembrane domain and an intracellular domain of a Fas polypeptide.

One feature of the present invention is that the vector and the VEGF antagonist are administered concurrently or sequentially. Another feature of the invention is that the vector is administered prior to the VEGF antagonist.

In one embodiment, the vector is administered at an effective amount of equal to or less than about 1×10¹³, 9×10¹², 8×10¹², 7×10¹², 6×10¹², 5×10¹², 4×10¹², 3×10¹², 2×10¹², 1×10¹², 9×10¹¹, 8×10¹¹, 7×10¹¹, 6×10¹¹, 5×10¹¹, 4×10¹¹, 3×10¹¹, 2×10¹¹ 1×10¹¹, 9×10¹⁰, 8×10¹⁰, 7×10¹⁰, 6×10¹⁰, 5×10¹⁰, 4×10¹⁰, 3×10¹⁰, 2×10¹⁰, or 1×10¹⁰ virus particles.

In one embodiment, the vector is administered at an effective amount of at least about 1×10¹¹ virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹² virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹³ virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹⁴ virus particles.

In another embodiment of the present invention, bevacizumab is administered at an effective amount of equal to or less than about 15 mg/kg, 14 mg/kg, 13 mg/kg, 12 mg/kg, 11 mg/kg, 10 mg/kg, 9 mg/kg, 8 mg/kg, 7 mg/kg, 6 mg/kg, 5 mg/kg, 4 mg/kg, 3 mg/kg, 2 mg/kg, or 1 mg/kg.

In another embodiment of the present invention, the vector is administered at an effective amount of 3×10¹² to 1×10¹³ virus particles and bevacizumab is administered at an effective amount of 5 mg/kg to 15 mg/kg.

In other embodiments, the VEGF antagonist is an anti-VEGF receptor binding antibody or a VEGF receptor binding molecule. In another embodiment, the anti-VEGF receptor binding antibody is a monoclonal antibody, a humanized antibody, a human antibody, a single chain antibody, or a chimeric antibody. For example, a VEGF antagonist can be selected from bevacizumab, ranibizumab, VGX-100, r84, aflibercept, IMC-18F1, IMC-1C11, ramucirumab, and any combination thereof.

In some embodiments, the vector is repeatedly administered. The vector can be repeatedly administered every day, once in about 2 days, once in about 3 days, once in about 4 days, once in about 5 days, once in about 6 days, once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 5 weeks, once in about 6 weeks, once in about 7 weeks, once in about 2 months, or once in about 6 months. In certain embodiments, the bevacizumab is repeatedly administered. In another embodiment of the invention, the bevacizumab is repeatedly administered once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 2 months, once in about 3 months, once in about 4 months, once in about 5 months, or once in about 6 months.

EMBODIMENTS

E1. A method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising administering a VEGF antagonist to the subject, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist and wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector.

E2. A method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising:

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,         wherein the responsiveness of the subject to a VEGF antagonist         is increased after administration of the vector, and     -   (ii) administering the VEGF antagonist to the subject.

E3. A method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,     -   (ii) administering a VEGF antagonist to the subject, and     -   (iii) measuring responsiveness of the subject to the VEGF         antagonist, wherein the responsiveness of the subject is         increased after the administration of the vector.

E4. The method of any one of embodiments E1 to E3, wherein the tumor size of the subject is reduced after the administration of the VEGF antagonist.

E5. A method of reducing the size of a tumor in a subject in need thereof comprising administering a VEGF antagonist to the subject, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist, wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector and before administration of the VEGF antagonist, and wherein the tumor size in the subject is reduced after administration of the VEGF antagonist.

E6. A method of reducing the size of a tumor in a subject in need thereof comprising:

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,         wherein the responsiveness of the subject to a VEGF antagonist         is increased after the administration of the vector, and     -   (ii) administering the VEGF antagonist to the subject, wherein         the tumor size in the subject is reduced after administration of         the VEGF antagonist.

E7. A method of reducing the size of a tumor in a subject in need thereof comprising:

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,     -   (ii) administering a VEGF antagonist to the subject; and     -   (iii) measuring the responsiveness of the subject to the VEGF         antagonist, wherein the responsiveness of the subject to the         VEGF antagonist is increased after the administration of the         vector.

E8. The method of any one of embodiments E4 to E7, wherein the tumor size is reduced compared to the tumor size of a subject who is not administered with the vector prior to the administration of the VEGF antagonist.

E9. The method of any one of embodiments E4 to E8, wherein the tumor size is measured by comparing the size of the tumor prior to the administration of the VEGF antagonist and the size of the tumor after the administration of the VEGF antagonist.

E10. A method of treating a disease or condition associated with tumor in a subject comprising administering a VEGF antagonist to a subject in need thereof, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist and wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector and before administration of the VEGF antagonist.

E11. A method of treating a disease or condition associated with tumor in a subject comprising

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,         wherein the responsiveness of the subject to a VEGF antagonist         is increased after the administration of the vector, and     -   (ii) administering the VEGF antagonist to the subject.

E12. A method of treating a disease or condition associated with tumor in a subject comprising

-   -   (i) administering a vector which comprises a Fas-chimera gene         operably linked to an endothelial cell specific promoter,     -   (ii) administering a VEGF antagonist to the subject; and     -   (iii) measuring responsiveness of the subject to the VEGF         antagonist, wherein the responsiveness of the subject to the         VEGF antagonist is increased after administration of the vector.

E13. The method of any one of embodiments E1 to E12, wherein the tumor of the subject is progressed after the administration of the vector.

E14. A method of identifying a candidate for a VEGF antagonist therapy comprising (i) measuring a tumor size of a subject who is diagnosed as having a tumor prior to administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter to the subject and (ii) measuring progression of the tumor after the administration of the vector, wherein the subject is identified as a candidate after the tumor is progressed.

E15. A method of identifying a candidate for a VEGF antagonist therapy comprising (i) measuring a tumor size of a subject who is diagnosed as having a tumor prior to administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter to the subject, (ii) measuring progression of the tumor after the administration of the vector, wherein the subject is identified as a candidate after the tumor is progressed, and (iii) instructing a healthcare provider to administer a VEGF antagonist to the subject.

E16. The method of any one of embodiments E13 to E15, wherein the tumor progression is measured by the growth of the tumor.

E17. The method of embodiment E16, wherein the growth of the tumor is measured by MRI.

E18. The method of any one of embodiments E1 to E17, wherein the tumor of the subject is a recurrent tumor that arose during treatment with the vector.

E19. The method of any one of embodiments E1 to E18, wherein the tumor of the subject is a metastatic tumor that arose during treatment with the vector.

E20. The method of any one of embodiments E13-E19, wherein the tumor progression is measured at least three weeks, at least four weeks, at least one month, at least five weeks, at least six weeks, at least seven weeks, at least eight weeks, at least nine weeks, at least ten weeks, at least 11 weeks, at least 12 weeks, at least 13 weeks, at least 14 weeks, at least 15 weeks, or at least 16 weeks after administration of the vector.

E21. The method of any one of embodiments E1 to E20, wherein the tumor size is measured at least one week, at least two weeks, at least three weeks, at least four weeks, at least five weeks, at least six weeks, at least seven weeks, or at least eight weeks prior to administration of the vector.

E22. The method of any one of embodiments E1 to E21, wherein the VEGF antagonist is repeatedly administered after identifying that the tumor of the subject is progressed.

E23. The method of embodiment E22, wherein the VEGF antagonist is repeatedly administered once in about 7 days, once in about ten days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 2 months, once in about 3 months, once in about 4 months, once in about 5 months, or once in about 6 months.

E24. The method of embodiment E22, wherein the VEGF antagonist is repeatedly administered once in about two weeks.

E25. The method of any one of embodiments E1 to E24, wherein the vector is repeatedly administered after administering the VEGF antagonist.

E26. The method of embodiment E25, wherein the vector is repeatedly administered every day, once in about 2 days, once in about 3 days, once in about 4 days, once in about 5 days, once in about 6 days, once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 5 weeks, once in about 6 weeks, once in about 7 weeks, once in about 8 weeks, once in about 9 weeks, once in about 2 months, once in about 3 months, once in about 4 months, once in about 5 months, or once in about 6 months.

E27. The method of any one of embodiments E1 to E26, wherein the vector is administered every 2 months and bevacizumab is administered every 2 weeks.

E28. The method of any one of embodiments E1 to E27, wherein the subject is in need of induced responsiveness to a VEGF antagonist.

E29. The method of any one of embodiments E1 to E27, wherein the subject is in need of improved responsiveness to a VEGF antagonist.

E30. The method of any one of embodiments E1 to E29, wherein the responsiveness of the subject to the VEGF antagonist is an anti-angiogenesis property of the VEGF antagonist.

E31. The method of any one of embodiments E1 to E30, wherein the responsiveness of the subject to the VEGF antagonist is an anti-tumor effect of the VEGF antagonist.

E32. The method of any one of embodiments E1 to E31, wherein the VEGF antagonist is an anti-VEGF antibody or a VEGF binding molecule.

E33. The method of embodiment E32, wherein the anti-VEGF antibody is a monoclonal antibody, a humanized antibody, a human antibody, a single chain antibody, or a chimeric antibody.

E34. The method of any one of embodiments E1 to E33, wherein the VEGF antagonist comprises Fab, F(ab)2, Fv, or scFv.

E35. The method of any one of embodiments E1 to E34, wherein the VEGF antagonist is an anti-VEGF receptor binding antibody or a VEGF receptor binding molecule.

E36. The method of any one of embodiments E1 to E35, wherein the VEGF antagonist is selected from bevacizumab, ranibizumab, VGX-100, r84, aflibercept, IMC-18F1, IMC-1C11, ramucirumab, and any combination thereof.

E37. The method of embodiment E36, wherein the VEGF antagonist is bevacizumab.

E38. The method of any one of embodiments E1 to E37, wherein the Fas-chimera gene product comprises a polypeptide comprising an extracellular domain of a TNF Receptor 1 (TNFR1) polypeptide fused to a transmembrane domain and an intracellular domain of a Fas polypeptide.

E39. The method of embodiment E38, wherein the extracellular domain of the TNFR1 comprises an amino acid sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 4, wherein the extracellular domain of the TNFR1 is capable of binding to TNF-α.

E40. The method of embodiment E39, wherein the trans-membrane domain and the intracellular domain of the Fas polypeptide comprises an amino acid sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 8, wherein the trans-membrane domain and the intracellular domain of the Fas polypeptide is capable of inducing Fas mediated apoptosis.

E41. The method of any one of embodiments E1 to E40, wherein the Fas-chimera gene comprises a first nucleotide sequence, which is at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 3, and a second nucleotide sequence, which is at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 7.

E42. The method of any one of embodiments E1 to E41, wherein the endothelial cell specific promoter comprises a PPE-1 promoter.

E43. The method of any one of embodiments E1 to E42, wherein the endothelial cell specific promoter further comprises an enhancer.

E44. The method of embodiment E43, wherein the enhancer comprises a nucleotide sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 15 or SEQ ID NO: 16, wherein the enhancer induces an improved endothelial cell specificity compared to an endothelial cell specific promoter without the enhancer.

E45. The method of embodiment E44, wherein the enhancer comprises SEQ ID NO: 11 or SEQ ID NO: 12.

E46. The method of embodiment E45, wherein the enhancer further comprises SEQ ID NO: 13 or SEQ ID NO: 14.

E47. The method of any one of embodiments E1 to E46, wherein the endothelial cell specific promoter is a PPE-1-3X promoter.

E48. The method of embodiment E47, wherein the PPE-1-3X promoter comprises a nucleotide sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 18, wherein the PPE-1-3X promoter is capable of directing the Fas-chimera gene expression in endothelial cells.

E49. The method of any one of embodiments E1 to E48, wherein the vector does not contain an E1 region of an adenovirus.

E50. The method of any one of embodiments E1 to E49, wherein the vector and the VEGF antagonist are administered concurrently or sequentially.

E51. The method of embodiment E50, wherein the vector is administered prior to the VEGF antagonist.

E52. The method of any one of embodiments E1 to E51, wherein the vector is administered at an effective amount of equal to or less than about 1×10¹³, 9×10¹², 8×10¹², 7×10¹², 6×10¹², 5×10¹², 4×10¹², 3×10¹², 2×10¹², 1×10¹², 9×10¹¹, 8×10¹¹, 7×10¹¹ 6×10¹¹, 5×10¹¹, 4×10¹¹, 3×10¹¹, 2×10¹¹, 1×10¹¹, 9×10¹⁰, 8×10¹⁰, 7×10¹⁰, 6×10¹⁰, 5×10¹⁰, 4×10¹⁰, 3×10¹⁰, 2×10¹⁰, or 1×10¹⁰ virus particles.

E53. The method of any one of embodiments E36 to E52, wherein bevacizumab is administered at an effective amount of less than about 15 mg/kg, 14 mg/kg, 13 mg/kg, 12 mg/kg, 11 mg/kg, 10 mg/kg, 9 mg/kg, 8 mg/kg, 7 mg/kg, 6 mg/kg, 5 mg/kg, 4 mg/kg, 3 mg/kg, 2 mg/kg, or 1 mg/kg.

E54. The method of any one of embodiments E36 to E53, wherein the vector is administered at an effective amount of 3×10¹² to 1 to 10¹³ virus particles and bevacizumab is administered at an effective amount of 5 mg/kg to 15 mg/kg.

E55. The method of any one of embodiments E32 to E54, wherein the anti-VEGF antibody or the VEGF binding molecule comprises at least one CDR selected from the group consisting of V_(H) CDR1 (SEQ ID NO: 28), V_(H) CDR2 (SEQ ID NO: 29), V_(H) CDR3 (SEQ ID NO: 30), V_(L) CDR1 (SEQ ID NO: 31), V_(H) CDR2 (SEQ ID NO: 32), V_(H) CDR3 (SEQ ID NO: 33), and any combination thereof.

E56. The method of embodiment E55, wherein the anti-VEGF antibody or the VEGF binding molecule comprises V_(H) CDR1 (SEQ ID NO: 28), V_(H) CDR2 (SEQ ID NO: 29), and V_(H) CDR3 (SEQ ID NO: 30).

E57. The method of embodiment E55, wherein the anti-VEGF antibody or the VEGF binding molecule comprises V_(L) CDR1 (SEQ ID NO: 31), V_(L) CDR2 (SEQ ID NO: 32), and V_(L) CDR3 (SEQ ID NO: 33).

E58. The method of embodiment E55, wherein the anti-VEGF antibody or VEGF binding molecule comprises V_(H) CDR1 (SEQ ID NO: 28), V_(H) CDR2 (SEQ ID NO: 29), V_(H) CDR3 (SEQ ID NO: 30), V_(L) CDR1 (SEQ ID NO: 31), V_(L) CDR2 (SEQ ID NO: 32), and V_(L) CDR3 (SEQ ID NO: 33).

E59. The method of any one of embodiments E1 to E58, wherein the subject is in need of a reduction of angiogenesis.

E60. The method of embodiment E59, wherein the vector and the VEGF antagonist reduce angiogenesis.

E61. The method of any one of embodiments E1 to E60, wherein the vector is an adenovirus vector.

E62. The method of embodiment E61, wherein the adenovirus vector is adenovirus serotype 5.

E63. The method of any one of embodiments E1 to E62, wherein the vector comprises, consists of, or consists essentially of SEQ ID NO: 19.

E64. The method of any one of embodiments E1 to E63, wherein the vector is an isolated virus having European Collection of Cell Cultures (ECACC) Accession Number 13021201.

E65. The method of any one of embodiments E1 to E64, wherein the promoter comprises a hypoxia response element.

E66. The method of any one of embodiments E1 to E65, wherein the vector is administered at an effective amount of about 1×10¹¹, about 1×10¹², about 1×10¹³, or about 1×10¹⁴ virus particles.

E67. The method of any one of embodiments E1 to E66, wherein the tumor is a brain tumor.

E68. The method of embodiment E67, wherein the brain tumor is glioblastoma multiforme.

BRIEF DESCRIPTION OF THE DRAWINGS/FIGURES

FIG. 1 shows a combination therapy regimen of an adenovirus comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter (e.g., VB-111) and bevacizumab (BEV). 1×10¹³ VPs of VB-111 can be administered every eight weeks, and bevacizumab can be administered every two weeks. MRI assessment can be performed every eight weeks to assess the tumor progression.

FIG. 2 shows the time for glioblastima disease progression from first relapse to second relapse in patients receiving a combination therapy regimen of an adenovirus comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter (e.g., VB-111) and bevacizumab (BEV).

FIG. 3 shows an example of a patient who was treated with a combination regimen of an adenovirus comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter (e.g., VB-111) and bevacizumab (BEV) upon glioblastoma disease progression.

DETAILED DESCRIPTION OF THE INVENTION I. Definitions

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present application including the definitions will control. Unless otherwise required by context, singular terms shall include pluralities and plural terms shall include the singular. All publications, patents and other references mentioned herein are incorporated by reference in their entireties for all purposes as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference.

Although methods and materials similar or equivalent to those described herein can be used in practice or testing of the present invention, suitable methods and materials are described below. The materials, methods and examples are illustrative only and are not intended to be limiting. Other features and advantages of the invention will be apparent from the detailed description and from the claims.

In order to further define this invention, the following terms and definitions are provided.

The term “about” is used herein to mean approximately, roughly, around, or in the regions of. When the term “about” is used in conjunction with a numerical range, it modifies that range by extending the boundaries above and below the numerical values set forth. In general, the term “about” is used herein to modify a numerical value above and below the stated value by a variance of 10 percent, up or down (higher or lower).

As used herein, “antibody” means an intact immunoglobulin, an antigen-binding fragment thereof, or an antigen-binding molecule. Antibodies of this invention can be of any isotype or class (e.g., M, D, G, E and A) or any subclass (e.g., G1-4, A1-2) and can have either a kappa (κ) or lambda (λ) light chain.

The term “effective amount” as used herein refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired result. A desired result can be, for example, reduction or inhibition of neo-vascularization or angiogenesis in vitro or in vivo. An effective amount need not be a complete removal of neo-vascularization or angiogenesis.

As used herein, a “therapeutically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired therapeutic result. A desired therapeutic result may be, e.g., lessening of symptoms, regression or stabilization of tumor size in radiological imaging, prolonged survival, improved mobility, and the like. A therapeutic result need not be a “cure.” In some embodiments, a therapeutically effective amount is an amount or dosage that is necessary to prevent occurrence of a tumor.

As used herein, a “prophylactically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired prophylactic result. In some embodiments, since a prophylactic dose is used in subjects prior to or at an earlier stage of disease, the prophylactically effective amount will be less than the therapeutically effective amount.

The term “polynucleotide” or “nucleotide” is intended to encompass a singular nucleic acid as well as plural nucleic acids, and refers to an isolated nucleic acid molecule or construct, e.g., messenger RNA (mRNA) or plasmid DNA (pDNA). In certain embodiments, a polynucleotide comprises a conventional phosphodiester bond or a non-conventional bond (e.g., an amide bond, such as found in peptide nucleic acids (PNA)).

As used herein, a “polynucleotide,” “nucleotide,” or “nucleic acid” can be used interchangeably and contain the nucleotide sequence of the full-length cDNA sequence, including the untranslated 5′ and 3′ sequences, the coding sequences, as well as fragments, epitopes, domains, and variants of the nucleic acid sequence. The polynucleotide can be composed of any polyribonucleotide or polydeoxyribonucleotide, which may be unmodified RNA or DNA or modified RNA or DNA. For example, polynucleotides can be composed of single- and double-stranded DNA, DNA that is a mixture of single- and double-stranded regions, single- and double-stranded RNA, and RNA that is mixture of single- and double-stranded regions, hybrid molecules comprising DNA and RNA that may be single-stranded or, more typically, double-stranded or a mixture of single- and double-stranded regions. In addition, the polynucleotides can be composed of triple-stranded regions comprising RNA or DNA or both RNA and DNA. Polynucleotides may also contain one or more modified bases or DNA or RNA backbones modified for stability or for other reasons. “Modified” bases include, for example, tritylated bases and unusual bases such as inosine. A variety of modifications can be made to DNA and RNA; thus, “polynucleotide” embraces chemically, enzymatically, or metabolically modified forms.

In the present invention, a polypeptide can be composed of amino acids joined to each other by peptide bonds or modified peptide bonds, i.e., peptide isosteres, and may contain amino acids other than the 20 gene-encoded amino acids (e.g. non-naturally occurring amino acids). The polypeptides of the present invention may be modified by either natural process, such as posttranslational processing, or by chemical modification techniques which are well known in the art. Such modifications are well described in basic texts and in more detailed monographs, as well as in a voluminous research literature. Modifications can occur anywhere in the polypeptide, including the peptide backbone, the amino acid side-chains and the amino or carboxyl termini. It will be appreciated that the same type of modification may be present in the same or varying degrees at several sites in a given polypeptide. Also, a given polypeptide may contain many types of modifications. Polypeptides may be branched, for example, as a result of ubiquitination, and they may be cyclic, with or without branching. Cyclic, branched, and branched cyclic polypeptides may result from posttranslation natural processes or may be made by synthetic methods. Modifications include acetylation, acylation, ADP-ribosylation, amidation, covalent attachment of flavin, covalent attachment of a heme moiety, covalent attachment of a nucleotide or nucleotide derivative, covalent attachment of a lipid or lipid derivative, covalent attachment of phosphotidylinositol, cross-linking, cyclization, disulfide bond formation, demethylation, formation of covalent cross-links, formation of cysteine, formation of pyroglutamate, formylation, gamma-carboxylation, glycosylation, GPI anchor formation, hydroxylation, iodination, methylation, myristoylation, oxidation, pegylation, proteolytic processing, phosphorylation, prenylation, racemization, selenoylation, sulfation, transfer-RNA mediated addition of amino acids to proteins such as arginylation, and ubiquitination. (See, for instance, Proteins—Structure And Molecular Properties, 2nd Ed., T. E. Creighton, W.H. Freeman and Company, New York (1993); Posttranslational Covalent Modification of Proteins, B. C. Johnson, Ed., Academic Press, New York, pgs. 1-12 (1983); Seifter et al., Meth Enzymol 182:626-646 (1990); Rattan et al., Ann NY Acad Sci 663:48-62 (1992).)

The terms “fragment,” “variant,” “derivative” and “analog” when referring to any polypeptide or polynucleotide of the present invention include any polypeptides or polynucleotides which retain at least some activities, i.e., the ability to function as any naturally-occurring function of the polypeptide or polynucleotide. For example, a “fragment,” “variant,” “derivative” and “analog” of Tumor necrosis factor Receptor 1 (TNFR1) has some activities of the naturally occurring full-length TNFR1, e.g., the ability to bind to TNFR1 ligand, i.e., TNF-alpha or lymphotoxin. In another example, a “fragment,” “variant,” “derivative” and “analog” of a FAS polypeptide have some activities of a naturally-occurring full-length FAS polypeptide, e.g., the ability to induce apoptosis. In other examples, a “fragment,” “variant,” “derivative” and “analog” of an endothelial cell-specific promoter can induce endothelial cell-specific expression of a gene operably linked to the promoter. Additional non-limiting examples of the various fragments, variants, analogues, or derivatives of the TNFR1, FAS polypeptide, and endothelial cell-specific promoters are described below.

In the present invention, a “polypeptide fragment” or “protein fragment” refers to a short amino acid sequence of a polypeptide. Protein or polypeptide fragments may be “free-standing,” or comprised within a larger polypeptide of which the fragment forms a part of region. Representative examples of polypeptide fragments of the invention, include, for example, fragments comprising about 5 amino acids, about 10 amino acids, about 15 amino acids, about 20 amino acids, about 30 amino acids, about 40 amino acids, about 50 amino acids, about 60 amino acids, about 70 amino acids, about 80 amino acids, about 90 amino acids, or about 100 amino acids.

A “conservative amino acid substitution” is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art, including basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Thus, if an amino acid in a polypeptide is replaced with another amino acid from the same side chain family, the substitution is considered to be conservative. In another embodiment, a string of amino acids can be conservatively replaced with a structurally similar string that differs in order and/or composition of side chain family members.

The term “percent sequence identity” between two polynucleotide or polypeptide sequences refers to the number of identical matched positions shared by the sequences over a comparison window, taking into account additions or deletions (i.e., gaps) that must be introduced for optimal alignment of the two sequences. A matched position is any position where an identical nucleotide or amino acid is presented in both the target and reference sequence. Gaps presented in the target sequence are not counted since gaps are not nucleotides or amino acids. Likewise, gaps presented in the reference sequence are not counted since target sequence nucleotides or amino acids are counted, not nucleotides or amino acids from the reference sequence.

The percentage of sequence identity is calculated by determining the number of positions at which the identical amino-acid residue or nucleic acid base occurs in both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the window of comparison and multiplying the result by 100 to yield the percentage of sequence identity. The comparison of sequences and determination of percent sequence identity between two sequences may be accomplished using readily available software both for online use and for download. Suitable software programs are available from various sources, and for alignment of both protein and nucleotide sequences. One suitable program to determine percent sequence identity is bl2seq, part of the BLAST suite of program available from the U.S. government's National Center for Biotechnology Information BLAST web site (blast.ncbi.nlm.nih.gov). Bl2seq performs a comparison between two sequences using either the BLASTN or BLASTP algorithm. BLASTN is used to compare nucleic acid sequences, while BLASTP is used to compare amino acid sequences. Other suitable programs are, e.g., Needle, Stretcher, Water, or Matcher, part of the EMBOSS suite of bioinformatics programs and also available from the European Bioinformatics Institute (EBI) at www.ebi.ac.uk/Tools/psa.

Different regions within a single polynucleotide or polypeptide target sequence that aligns with a polynucleotide or polypeptide reference sequence can each have their own percent sequence identity. It is noted that the percent sequence identity value is rounded to the nearest tenth. For example, 80.11, 80.12, 80.13, and 80.14 are rounded down to 80.1, while 80.15, 80.16, 80.17, 80.18, and 80.19 are rounded up to 80.2. It also is noted that the length value will always be an integer.

One skilled in the art will appreciate that the generation of a sequence alignment for the calculation of a percent sequence identity is not limited to binary sequence-sequence comparisons exclusively driven by primary sequence data. Sequence alignments can be derived from multiple sequence alignments. One suitable program to generate multiple sequence alignments is ClustalW2, available from www.clustal.org. Another suitable program is MUSCLE, available from www.drive5.com/muscle/. ClustalW2 and MUSCLE are alternatively available, e.g., from the EBI.

It will also be appreciated that sequence alignments can be generated by integrating sequence data with data from heterogeneous sources such as structural data (e.g., crystallographic protein structures), functional data (e.g., location of mutations), or phylogenetic data. A suitable program that integrates heterogeneous data to generate a multiple sequence alignment is T-Coffee, available at www.tcoffee.org, and alternatively available, e.g., from the EBI. It will also be appreciated that the final alignment used to calculated percent sequence identity may be curated either automatically or manually.

As used herein, the terms “linked,” “fused,” “fusion,” “chimeric,” and “chimera” are used interchangeably. These terms refer to the joining together of two more elements or components, by whatever means including chemical conjugation or recombinant means. An “in-frame fusion” refers to the joining of two or more open reading frames (ORFs) to form a continuous longer ORF, in a manner that maintains the correct reading frame of the original ORFs. Thus, the resulting recombinant fusion or chimeric protein is a single protein containing two or more segments that correspond to polypeptides encoded by the original ORFs (which segments are not normally so joined in nature.) Although the reading frame is thus made continuous throughout the fused segments, the segments may be physically or spatially separated by, for example, in-frame linker sequence.

The terms “heterologous” and “heterologous moiety” mean that a polynucleotide, polypeptide, or other moiety is derived from a distinct entity from that of the entity to which it is being compared. For instance, a heterologous polypeptide can be synthetic, or derived from a different species, different cell type of an individual, or the same or different type of cell of distinct individuals. In one aspect, a heterologous moiety can be a polypeptide fused to another polypeptide to produce a fusion polypeptide or protein. In another aspect, a heterologous moiety can be a non-polypeptide such as PEG conjugated to a polypeptide or protein.

In the context of polypeptides, a “linear sequence” or a “sequence” is an order of amino acids in a polypeptide in an amino to carboxyl terminal direction in which residues that neighbor each other in the sequence are contiguous in the primary structure of the polypeptide.

The term “expression” as used herein refers to a process by which a gene produces a biochemical, for example, an RNA or polypeptide. The process includes any manifestation of the functional presence of the gene within the cell including, without limitation, gene knockdown as well as both transient expression and stable expression. It includes without limitation transcription of the gene into messenger RNA (mRNA), transfer RNA (tRNA), small hairpin RNA (shRNA), small interfering RNA (siRNA) or any other RNA product and the translation of such mRNA into polypeptide(s). If the final desired product is biochemical, expression includes the creation of that biochemical and any precursors.

The term “complementarity determining region” (CDR) as used herein refers to the amino acid residues of an antibody which are responsible for binding to an antigen. The CDR regions of an antibody are found within the hypervariable region of both heavy and light chains of the antibody. Full length antibodies comprise three CDR regions in the heavy chain variable domain and three CDR regions in the light chain variable domain.

The term “repeatedly administered” as used herein refers to administration of a therapeutic agent on a repeated basis at defined, fixed intervals. The intervals of time between each administration may be altered during the course of the repeated administration and may be as long as 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, 2 months, 3 months, 4 months, 5 months, 6 months, 7 months, 8 months, 9 months, 10 months, 11 months, 1 year, or more.

The term “combination therapy” as used herein refers to the administration of two or more therapeutic modalities to treat a disease or condition. In one aspect of the present invention, combination therapy refers to the administration of a VEGF antagonist and a vector to a subject or a subject population in need thereof. In some embodiments, the combination therapy comprises administering the VEGF antagonist prior to administering the vector. In another embodiment, the combination therapy comprises administering the VEGF antagonist concomitantly with administration of the vector. In another embodiment, the combination therapy comprises administering the VEGF antagonist after administering the vector.

II. Nucleic Acid Constructs Comprising a Fas-Chimera Gene and an Endothelial Cell Specific Promoter

The present invention is related to methods of inducing or improving responsiveness to a VEGF antagonist in a subject or a subject population comprising administering a vector and a VEGF antagonist. The gene encoding the FAS-chimera protein (or gene product), in the present invention can be linked to an endothelial cell-specific promoter, which directs expression of the FAS-chimera gene product in an endothelial cell. Expression of such a cytotoxic gene product is useful in a situation where excessive neo-vascularization or blood vessel growth is not desirable, e.g., in a tumor.

The present invention also provides a homogeneous population of a nucleic acid construct comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter.

A. FAS-Chimera

A FAS-chimera protein expressed by the nucleic acid construct of the invention comprises at least two “death receptor” polypeptides, each of the polypeptides is derived from a different protein. The first polypeptide of the FAS-chimera protein comprises a ligand binding domain of Tumor Necrosis Factor Receptor 1 (TNFR1). The second polypeptide of the FAS-chimera protein comprises an effector domain of a FAS polypeptide.

The ligand binding domain of TNFR1 can be any domain that binds to a TNFR1 ligand. In one embodiment, the TNFR1 ligand is TNF-α. In another embodiment, the TNFR1 ligand is lymphotoxin-α. The ligand binding domain of TNFR1 can be an extracellular domain of TNFR1 or any fragments, variants, derivatives, or analogues thereof. Non-limiting examples of the TNFR1 ligand binding domain are described below.

The effector domain of a FAS polypeptide useful for the invention comprises any FAS domains that form death-inducing signaling complex (DISC), thereby inducing apoptosis. In one embodiment, an effector domain of a FAS polypeptide comprises an intracellular domain, a trans-membrane domain, or both. Non-limiting examples of FAS polypeptide effector domains are described below.

The TNFR1 and the FAS polypeptide can be linked by a peptide bond or by a linker. The linker connecting the TNFR1 ligand binding domain with the FAS effector domain can be a polypeptide linker or a non-peptide linker. For example, a linker for the FAS-chimera protein can comprise one or more glycine, serine, leucine, or any combinations thereof. In one embodiment, a linker useful for the invention comprises Ser-Leu. In another embodiment, a linker useful for the invention comprises (GGGS)n, (Denise et al. J. Biol. Chem. 277:35035-35043 (2002)), wherein n can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 or more (SEQ ID NO: 27).

1. Tumor Necrosis Factor Receptor 1

The full-length human TNFR1 polypeptide is 455 amino acids in length and is also known as TNF-R1, Tumor necrosis factor receptor type I (TNFRI), TNFR-I, TNFRSF1A, TNFAR, p55, P60, or CD120a. Naturally-occurring human TNFR1 polypeptide is known to bind to TNF-α or homotrimeric lymphotoxin-α. Binding of TNF-α to the extracellular domain leads to homotrimerization of TNFR1, which then interacts specifically with the death domain of Tumor Necrosis Factor Receptor Type 1-Associated Death Domain Protein (TRADD). Various TRADD-interacting proteins such as TNF Receptor Associated Factors (TRAFS), Receptor-Interacting Serine/Threonine-Protein Kinase 1 (RIPK1), and Fas-Associated Protein with Death Domain (FADD) are recruited to the complex by their association with TRADD. The complex activates at least two distinct signaling cascades, apoptosis and NF-kappa-B signaling.

A 455 aa polypeptide sequence reported as a human TNFR1 polypeptide sequence has the identifier number P19438-1 in the UniProtKB database. This human TNFR1 polypeptide sequence is designated herein as isoform A and SEQ ID NO: 2. SEQ ID NO: 1 is a nucleotide sequence encoding SEQ ID NO: 2. A polypeptide sequence of 108 aa was reported as an isoform of the human TNFR1 polypeptide sequence and has the identifier number P19438-2 in the UniProtKB database. The 108 aa polypeptide corresponds to amino acids 1 to 108 of isoform A (SEQ ID NO: 2) and is designated herein as isoform B. Another variant of the human TNFR1 polypeptide having 232 aa was reported as the identifier number P19438-3 in the UniProtKB database. The 232 aa polypeptide corresponds to amino acids 1 to 232 of isoform A (SEQ ID NO: 2) and is designated herein as isoform C. Additional natural variants of human TNFR1 include, but are not limited to, the TNFR1 polypeptide of isoforms A, B, and C comprising one or more mutations selected from the group consisting of H51Q, C59R, C59S, C62G, C62Y, P75L, T79M, C81F, C99S, S115G, C117R, C117Y, R121P, R121Q, P305T, and any combinations thereof. Other known TNFR1 variants include the TNFR1 polypeptide of isoforms A, B, and C comprising L13LILPQ, K255E, S286G, R394L, 412: Missing, GPAA443-446APP, or any combinations thereof.

Table 1 shows the human wild-type TNFR1 amino acid sequence and a nucleotide sequence encoding the wild-type TNFR1.

TABLE 1 TNFR1 Sequences SEQ ID No. Sequences Amino MGLSTVPDLLLPLVLLELLVGIYPSGVIGLVPHLGDREKRDSVCPQGKYIHPQNNSICCT acid KCHKGTYLYNDCPGPGQDTDCRECESGSFTASENHLRHCLSCSKCRKEMGQVEISSCTVD sequence RDTVCGCRKNQYRHYWSENLFQCFNCSLCLNGTVHLSCQEKQNTVCTCHAGFFLRENECV of TNFR1 SCSNCKKSLECTKLCLPQIENVKGTEDSGTTVLLPLVIFFGLCLLSLLFIGLMYRYQRWK (SEQ ID SKLYSIVCGKSTPEKEGELEGTTTKPLAPNPSFSPTPGFTPTLGFSPVPSSTFTSSSTYT NO: 2) PGDCPNFAAPRREVAPPYQGADPILATALASDPIPNPLQKWEDSAHKPQSLDTDDPATLY AVVENVPPLRWKEFVRRLGLSDHEIDRLELQNGRCLREAQYSMLATWRRRTPRREATLEL LGRVLRDMDLLGCLEDIEEALCGPAALPPAPSLLR Nucleotide Atgggcctctccaccgtgcctgacctgctgctgccgctggtgctcctggagctgttggtg Sequence Ggaatatacccctcaggggttattggactggtccctcacctaggggacagggagaagaga encoding Gatagtgtgtgtccccaaggaaaatatatccaccctcaaaataattcgatttgctgtacc TNFR1 Aagtgccacaaaggaacctacttgtacaatgactgtccaggcccggggcaggatacggac (SEQ ID Tgcagggagtgtgagagcggctccttcaccgcttcagaaaaccacctcagacactgcctc NO: 1) Agctgctccaaatgccgaaaggaaatgggtcaggtggagatctcttcttgcacagtggac Cgggacaccgtgtgtggctgcaggaagaaccagtaccggcattattggagtgaaaacctt Ttccagtgcttcaattgcagcctctgcctcaatgggaccgtgcacctctcctgccaggag Aaacagaacaccgtgtgcacctgccatgcaggtttctttctaagagaaaacgagtgtgtc Tcctgtagtaactgtaagaaaagcctggagtgcacgaagttgtgcctaccccagattgag Aatgttaagggcactgaggactcaggcaccacagtgctgttgcccctggtcattttcttt Ggtctttgccttttatccctcctcttcattggtttaatgtatcgctaccaacggtggaag Tccaagctctactccattgtttgtgggaaatcgacacctgaaaaagagggggagcttgaa Ggaactactactaagcccctggccccaaacccaagcttcagtcccactccaggcttcacc Cccaccctgggcttcagtcccgtgcccagttccaccttcacctccagctccacctatacc Cccggtgactgtcccaactttgcggctccccgcagagaggtggcaccaccctatcagggg Gctgaccccatccttgcgacagccctcgcctccgaccccatccccaacccccttcagaag Tgggaggacagcgcccacaagccacagagcctagacactgatgaccccgcgacgctgtac Gccgtggtggagaacgtgcccccgttgcgctggaaggaattcgtgcggcgcctagggctg Agcgaccacgagatcgatcggctggagctgcagaacgggcgctgcctgcgcgaggcgcaa Tacagcatgctggcgacctggaggcggcgcacgccgcggcgcgaggccacgctggagctg Ctgggacgcgtgctccgcgacatggacctgctgggctgcctggaggacatcgaggaggcg ctttgcggccccgccgccctcccgcccgcgcccagtcttctcaga Amino MGLSTVPDLLLPLVLLELLVGIYPSGVIGLVPHLGDREKRDSVCPQGKYIHPQNNSICCT acid KCHKGTYLYNDCPGPGQDTDCRECESGSFTASENHLRHCLSCSKCRKEMGQVEISSCTVD sequence RDTVCGCRKNQYRHYWSENLFQCFNCSLCLNGTVHLSCQEKQNTVCTCHAGFFLRENECV of a SCSNCKKSLECTKLCLP Ligand Binding Domain of TNFR1 (SEQ ID NO: 4) Nucleotide atgggcctct ccaccgtgcc tgacctgctg ctgccgctgg tgctcctgga sequence gctgttggtg ggaatatacc cctcaggggt tattggactg gtccctcacc encoding a taggggacag ggagaagaga gatagtgtgt gtccccaagg aaaatatatc Ligand caccctcaaa ataattcgat ttgctgtacc aagtgccaca aaggaaccta Binding cttgtacaat gactgtccag gcccggggca ggatacggac tgcagggagt Domain of gtgagagcgg ctccttcacc gcttcagaaa accacctcag acactgcctc TNFR1 agctgctcca aatgccgaaa ggaaatgggt caggtggaga tctcttcttg (SEQ ID cacagtggac cgggacaccg tgtgtggctg caggaagaac cagtaccggc NO: 3) attattggag tgaaaacctt ttccagtgct tcaattgcag cctctgcctc aatgggaccg tgcacctctc ctgccaggag aaacagaaca ccgtgtgcac ctgccatgca ggtttctttc taagagaaaa cgagtgtgtc tcctgtagta actgtaagaa aagcctggag tgcacgaagt tgtgcctacc a

The mouse TNFR1 polypeptide sequence and its variants are also reported. The 454 aa mouse TNFR1 polypeptide has the identifier number P25118 in UniProtKB database. TNFR1 polypeptides known in other animals include, but are not limited to, rat (e.g., P22934 in the UniProtKB database), cow (e.g., O19131 in the UniProtKB database), pig (e.g., P50555 in the UniProtKB database), or horse (e.g., D1MH71 in the UniProtKB database).

The full-length TNFR1 can be cleaved into two chains, (1) TNF Receptor Superfamily Member 1A, membrane form (i.e., amino acids 22 to 455 corresponding to full-length TNFR1) and (2) TNF-binding protein 1 (TBPI) (i.e., amino acids 41 to 291 corresponding to full-length TNFR1). The full-length human TNFR1 polypeptide consists of a signal sequence (amino acids 1 to 21 of SEQ ID NO: 2), an extracellular domain (amino acids 22 to 211 of SEQ ID NO: 2), a trans-membrane domain (amino acids 212 to 234 of SEQ ID NO: 2), and a cytoplasmic domain (amino acids 235 to 455 of SEQ ID NO: 2). The TNFR1 extracellular domain comprises four cysteine repeat regions, TNFR-Cys1 (amino acids 43 to 82 corresponding to SEQ ID NO: 2), TNFR-Cys2 (amino acids 83 to 125 corresponding to SEQ ID NO: 2), TNFR-Cys3 (amino acids 126 to 166 corresponding to SEQ ID NO: 2), and TNFR-Cys4 (amino acids 167 to 196 corresponding to SEQ ID NO: 2).

As one of skill in the art will appreciate, the beginning and ending residues of the domains listed above can vary depending upon the computer modeling program used or the method used for determining the domain. As such, various functional domains of TNFR1 may vary from those defined above.

In one embodiment, a ligand binding domain of TNFR1 useful for the FAS-chimera protein comprises, consists essentially of, or consists of an extracellular domain of TNFR1, or any fragment, variant, derivative, or analogue thereof, wherein the extracellular domain of TNFR1, or any fragment, variant, derivative, or analogue thereof binds to TNF-α. In another embodiment, a ligand binding domain of TNFR1 comprises TNFR-Cys1; TNFR-Cys2; TNFR-Cys3; TNFR-Cys4; TNFR-Cys1 and TNFR-Cys2; TNFR-Cys1 and TNFR-Cys3; TNFR-Cys1 and TNFR-Cys4; TNFR-Cys2 and TNFR-Cys3; TNFR-Cys2 and TNFR-Cys4; TNFR-Cys3 and TNFR-Cys4; TNFR-Cys1, TNFR-Cys2, and TNFR-Cys3; TNFR-Cys1, TNFR-Cys2, and TNFR-Cys4; TNFR-Cys2, TNFR-Cys3, and TNFR-Cys4; or TNFR-Cys1, TNFR-Cys2, TNFR-Cys3, and TNFR-Cys4. In other embodiments, a ligand binding domain of TNFR1 in the FAS-chimera protein comprises TNF binding protein I. In yet other embodiments, a TNFR1 ligand binding domain of the FAS-chimera protein comprises, consists essentially of, or consists of an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 22 to 190, amino acids 22 to 191, amino acids 22 to 192, amino acids 22 to 193, amino acids 22 to 194, amino acids 22 to 195, amino acids 22 to 196, amino acids 22 to 197, amino acids 22 to 198, amino acids 22 to 199, amino acids 22 to 200, amino acids 22 to 201, amino acids 22 to 202, amino acids 22 to 203, amino acids 22 to 204, amino acids 22 to 205, amino acids 22 to 206, amino acids 22 to 207, amino acids 22 to 208, amino acids 22 to 209, amino acids 22 to 210, or amino acids 22 to 211 of SEQ ID NO: 2, wherein the ligand binding domain binds to a TNFR1 ligand, e.g., TNF-α.

In other embodiments, the ligand binding domain of TNFR1 further comprises a signal peptide. One example of the suitable signal peptides is the signal peptide of TNFR1, e.g., amino acids 1 to 21 of SEQ ID NO: 2. In yet other embodiments, a ligand binding domain of the FAS-chimera gene product comprises, consists essentially of, or consists of an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 1 to 190, amino acids 1 to 191, amino acids 1 to 192, amino acids 1 to 193, amino acids 1 to 194, amino acids 1 to 195, amino acids 1 to 196, amino acids 1 to 197, amino acids 1 to 198, amino acids 1 to 199, amino acids 1 to 200, amino acids 1 to 201, amino acids 1 to 202, amino acids 1 to 203, amino acids 1 to 204, amino acids 1 to 205, amino acids 1 to 206, amino acids 1 to 207, amino acids 1 to 208, amino acids 1 to 209, amino acids 1 to 210, or amino acids 1 to 211 of SEQ ID NO: 2, wherein the ligand binding domain binds to a TNFR1 ligand, e.g., TNF-α. In a specific embodiment, a TNFR1 ligand binding domain of the FAS-chimera protein comprises, consists essentially of, or consists of an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 4, wherein the ligand binding domain binds to a TNFR1 ligand, e.g., TNF-α.

In yet other embodiments, the ligand binding domain of TNFR1 is encoded by a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 3.

In still other embodiments, a TNFR1 ligand binding domain of the FAS-chimera protein comprises, consists essentially of, or consists of an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 22 to 108 of SEQ ID NO: 2 (TNFR1 isoform B), amino acids 22 to 232 of SEQ ID NO: 2 (TNFR1 isoform C), or amino acids 44 to 291 of SEQ ID NO: 2 (TBP1), wherein the ligand binding domain binds to a TNFR1 ligand, e.g., TNF-α.

2. FAS Polypeptide

The full-length human FAS polypeptide is 335 amino acids in length and is also known as Tumor Necrosis Factor Receptor Superfamily Member 6, Apo-1 antigen, Apoptosis-mediating surface antigen FAS, FASLG receptor, or CD95. Naturally occurring FAS polypeptide is a receptor for TNFSF6/FASLG. When the FAS polypeptide binds to the FAS ligand (FasL), the interaction between FAS and FasL results in the formation of the death-inducing signaling complex (DISC), which contains the FADD, caspase-8 and caspase-10. In some types of cells (type I), processed caspase-8 directly activates other members of the caspase family, and triggers the execution of apoptosis of the cell. In other types of cells (type II), the FAS-DISC starts a feedback loop that spirals into increasing release of proapoptotic factors from mitochondria and the amplified activation of caspase-8. FAS-mediated apoptosis may have a role in the induction of peripheral tolerance, in the antigen-stimulated suicide of mature cells or both.

A 335 aa polypeptide sequence reported as a human FAS polypeptide sequence has the identifier number P25445-1 in the UniProtKB database. This human FAS polypeptide sequence is designated herein as SEQ ID NO: 6. SEQ ID NO: 5 is a nucleotide sequence encoding SEQ ID NO: 6. The nucleotide sequence encoding the FAS polypeptide is also known as APT1, FAST, or TNFRSF6. The full-length FAS polypeptide contains a signal peptide (amino acids 1 to 25 corresponding to SEQ ID NO: 6), an extracellular domain (amino acids 26 to 173 corresponding to SEQ ID NO: 6), a trans-membrane domain (amino acids 174 to 190 corresponding to SEQ ID NO: 6), and an intracellular (or cytoplasmic) domain (amino acids 191 to 335 corresponding to SEQ ID NO: 6). The intracellular domain contains a death domain (e.g., amino acids 230 to 314 corresponding to SEQ ID NO: 6).

As one of skill in the art will appreciate, the beginning and ending residues of the domains listed above may vary depending upon the computer modeling program used or the method used for determining the domain. As such, various functional domains of FAS may vary from those defined above. Table 2 shows the wild-type human FAS amino acid sequence and a nucleotide sequence encoding the FAS protein.

TABLE 2 FAS Sequences Sequences Amino acid MLGIWTLLPLVLTSVARLSSKSVNAQVTDINSKGLELRKTVTTVETQNLEGLHHDGQFCH sequence of KPCPPGERKARDCTVNGDEPDCVPCQEGKEYTDKAHFSSKCRRCRLCDEGHGLEVEINCT human FAS RTQNTKCRCKPNFFCNSTVCEHCDPCTKCEHGIIKECTLTSNTKCKEEGSRSNLGWLCLL protein LLPIPLIVWVKRKEVQKTCRKHRKENQGSHESPTLNPETVAINLSDVDLSKYITTIAGVM (SEQ ID TLSQVKGFVRKNGVNEAKIDEIKNDNVQDTAEQKVQLLRNWHQLHGKKEAYDTLIKDLKK NO: 6) ANLCTLAEKIQTIILKDITSDSENSNFRNEIQSLV Nucleotide Atgctgggcatctggaccctcctacctctggttcttacgtctgttgctagattatcgtcc sequence Aaaagtgttaatgcccaagtgactgacatcaactccaagggattggaattgaggaagact encoding Gttactacagttgagactcagaacttggaaggcctgcatcatgatggccaattctgccat human FAS Aagccctgtcctccaggtgaaaggaaagctagggactgcacagtcaatggggatgaacca sequence Gactgcgtgccctgccaagaagggaaggagtacacagacaaagcccatttttcttccaaa (SEQ ID Tgcagaagatgtagattgtgtgatgaaggacatggcttagaagtggaaataaactgcacc NO: 5) Cggacccagaataccaagtgcagatgtaaaccaaactttttttgtaactctactgtatgt Gaacactgtgacccttgcaccaaatgtgaacatggaatcatcaaggaatgcacactcacc Agcaacaccaagtgcaaagaggaaggatccagatctaacttggggtggctttgtcttctt Cttttgccaattccactaattgtttgggtgaagagaaaggaagtacagaaaacatgcaga Aagcacagaaaggaaaaccaaggttctcatgaatctccaactttaaatcctgaaacagtg Gcaataaatttatctgatgttgacttgagtaaatatatcaccactattgctggagtcatg Acactaagtcaagttaaaggctttgttcgaaagaatggtgtcaatgaagccaaaatagat Gagatcaagaatgacaatgtccaagacacagcagaacagaaagttcaactgcttcgtaat Tggcatcaacttcatggaaagaaagaagcgtatgacacattgattaaagatctcaaaaaa Gccaatctttgtactcttgcagagaaaattcagactatcatcctcaaggacattactagt Gactcagaaaattcaaacttcagaaatgaaatccaaagcttggtctag Amino acid GSRSNLGWLCLLLLPIPLIVWVKRKEVQKTCRKHRKENQGS sequence of HESPTLNPETVAINLSDVDLSKYITTIAGVMTLSQVKGFVR an Effector KNGVNEAKIDEIKNDNVQDTAEQKVQLLRNWHQLHGKKEAY Domain of DTLIKDLKKANLCTLAEKIQTIILKDITSDSENSNFRNEIQ FAS (SEQ SLV ID NO: 8) Nucleotide Aggatccagatctaacttggggtggctttgtcttcttcttttgccaattccactaatt sequence Gtttgggtgaagagaaaggaagtacagaaaacatgcagaaagcacagaaaggaaaacc encoding an Aaggttctcatgaatctccaaccttaaatcctgaaacagtggcaataaatttatctga Effector Tgttgacttgagtaaatatatcaccactattgctggagtcatgacactaagtcaagtt Domain of Aaaggctttgttcgaaagaatggtgtcaatgaagccaaaatagatgagatcaagaatg FAS (SEQ Acaatgtccaagacacagcagaacagaaagttcaactgcttcgtaattggcatcaact ID NO: 7) Tcatggaaagaaagaagcgtatgacacattgattaaagatctcaaaaaagccaatctt Tgtactcttgcagagaaaattcagactatcatcctcaaggacattactagtgactcag aaaattcaaacttcagaaatgaaatccaaagcttggtctag

The mouse FAS polypeptide sequence and its variants are also reported. The 327 aa mouse FAS polypeptide has the identifier number P25446 in UniProtKB database. FAS polypeptides known in other animals include, but are not limited to, Old World monkey (e.g., Q9BDN4 in the UniProtKB database), Rhesus monkey (e.g., Q9BDP2 in the UniProtKB database), rat (e.g., Q63199 in the UniProtKB database), or cow (e.g., P51867 in the UniProtKB database).

Based on the sequence variation in the FAS polypeptide, a person of ordinary skill in the art can identify sequence variations in the effector domain of the FAS polypeptide. For example, natural variants of the FAS effector domains can include one or more substitutions or mutations of C178R, L180F, P183L, I184V, T1981, Y232C, T241K, T241P, V249L, R250P, R250Q, G253D, G253S, N255D, A257D, I259R, D260G, D260V, D260Y, I262S, N264K, T270I, T270K, E272G, E272K, L278F, K299N, T3051, I310S, or any combinations thereof.

In one embodiment, an effector domain of the FAS polypeptide useful for the invention comprises a death domain of the FAS polypeptide. In another embodiment, an effector domain of the FAS polypeptide comprises, consists essentially of, or consists of an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 230 to 314 of SEQ ID NO: 6. In other embodiments, an effector domain of the FAS polypeptide comprises an intracellular domain of the FAS polypeptide. In yet other embodiments, an effector domain of the FAS polypeptide comprises an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 185 to 335, amino acids 186 to 335, amino acids 187 to 335, amino acids 188 to 335, amino acids 189 to 335, amino acids 190 to 335, amino acids 191 to 335, amino acids 192 to 335, amino acids 193 to 335, amino acids 194 to 335, amino acids 195 to 335, amino acids 196 to 335, amino acids 197 to 335, amino acids 198 to 335, or amino acids 199 to 335 of SEQ ID NO: 6.

In still other embodiments, the effector domain of the FAS polypeptide further comprises a trans-membrane domain of the FAS polypeptide. In yet other embodiments, an effector domain of the FAS polypeptide comprises an amino acid sequence at least about 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 174 to 335 of SEQ ID NO: 6. In some embodiments, an effector domain of the FAS polypeptide further comprises about ten, about nine, about eight, about seven, about six, about five, about four, about three, about two, or about one amino acid from the C-terminal portion of the FAS extracellular domain. In certain embodiments, an effector domain of the FAS polypeptide comprises an amino acid sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to amino acids 179 to 335, amino acids 178 to 335, amino acids 177 to 335, amino acids 176 to 335, amino acids 175 to 335, amino acids 174 to 335, amino acids 173 to 335, amino acids 172 to 335, amino acids 171 to 335, amino acids 170 to 335, amino acids 169 to 335, amino acids 168 to 335, amino acids 167 to 335, amino acids 166 to 335, amino acids 165 to 335, amino acids 164 to 335, or amino acids 163 to 335 of SEQ ID NO: 6, wherein the effector domain forms a death-inducing signaling complex (DISC), activates caspase 8, or induces apoptosis.

In some embodiments, an effector domain of the FAS polypeptide comprises, consists essentially of, or consists of an amino acid sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 8, wherein the effector domain forms a death-inducing signaling complex (DISC), activates caspase 8, or induces apoptosis.

In other embodiments, an effector domain of the FAS polypeptide is encoded by a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 7.

In one embodiment, the FAS-chimera gene product for the invention comprises, consists essentially of, or consists of an amino acid sequence at least 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 10, wherein the FAS-chimera gene product induces apoptosis. In another embodiment, the FAS-chimera gene product is encoded by a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 9, wherein the FAS-chimera gene product induces apoptosis.

B. Endothelial Cell-Specific Promoter

The nucleic acid construct comprising a FAS-chimera gene further comprises one or more expression control elements useful for regulating the expression of an operably linked FAS-chimera gene. The expression control elements include, but are not limited to, promoters, secretion signals, and other regulatory elements.

The nucleic acid construct useful for the present invention utilizes an endothelial cell-specific promoter to direct expression of the FAS-chimera protein in an endothelial cell, thereby inducing apoptosis of the endothelial cell.

For the purpose of the present invention, an endothelial cell-specific promoter can contain one or more cis-regulatory elements, which improve the endothelial cell-specificity of the promoters compared to the promoter without the cis-regulatory elements. In one example, the cis-regulatory element comprises an enhancer. In another aspect, the cis-regulatory element comprises a hypoxia response element. In other examples, the cis-regulatory element comprises both an enhancer and a hypoxia response element.

In one embodiment, a cis-regulatory element useful for the invention comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 11 or SEQ ID NO: 12 (the complementary sequence of SEQ ID NO: 11), wherein the cis-regulatory element improves endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element. The cis-regulatory element can further comprise an additional nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 13 or SEQ ID NO: 14 (the complementary sequence of SEQ ID NO: 13).

In another embodiment, a cis-regulatory element for the invention comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 13 or SEQ ID NO: 14 (the complementary sequence of SEQ ID NO: 13), wherein the cis-regulatory element improves endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element. The cis-regulatory element can further comprise an additional nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 11 or SEQ ID NO: 12 (the complementary sequence of SEQ ID NO: 11).

In other embodiments, a cis-regulatory element for the invention comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 15 or SEQ ID NO: 16 (the complementary sequence of SEQ ID NO: 15), wherein the cis-regulatory element improves endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element. In yet other embodiments, a cis-regulatory element for the nucleic acid construct comprises SEQ ID NO: 7 or any fragments, variants, derivatives, or analogs thereof, wherein the fragments, variants, derivatives, or analogs improve endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element.

In some embodiments, a cis-regulatory element for the invention comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 22 or SEQ ID NO: 23, wherein the cis-regulatory element improves endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element. In yet other embodiments, a cis-regulatory element for the nucleic acid construct comprises SEQ ID NO: 22 or SEQ ID NO: 23 or any fragments, variants, derivatives, or analogs thereof, wherein the fragments, variants, derivatives, or analogs improve endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element.

In other embodiments, a cis-regulatory element for the invention comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% identical to SEQ ID NO: 24 or SEQ ID NO: 25, wherein the cis-regulatory element improves endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element. In yet other embodiments, a cis-regulatory element for the nucleic acid construct comprises SEQ ID NO: 24 or SEQ ID NO: 25 or any fragments, variants, derivatives, or analogs thereof, wherein the fragments, variants, derivatives, or analogs improve endothelial cell specificity of a promoter compared to a promoter without the cis-regulatory element.

Table 3 shows various cis-regulatory element sequences useful for the invention.

TABLE 3 Endothelial Cell-Specific Cis-regulatory Elements and Promoters SEQ ID NOs Sequences SEQ ID ctggagggtg actttgcttc tggagccagt acttcatact tttcatt NO: 11 SEQ ID aatgaaaagt atgaagtact ggctccagaa gcaaagtcac cctccag NO: 12 SEQ ID gtacttcata cttttcattc caatggggtg actttgcttc tgga NO: 13 SEQ ID tccagaagca aagtcacccc attggaatga aaagtatgaa gtac NO: 14 SEQ ID 3X element NO: 15 ctccagaagcaaagtcaccccattggaatgaaaagtatgaagtacaatgaaaagtatgaagt actggctccagaagcaaagtcaccctccagaagcaaagtcaccccattggaatgaaaagtat gaagtac SEQ ID 3x element (Complementary Sequence of SEQ ID NO: 15) NO: 16 gtacttcatacttttcattccaatggggtgactttgcttctggagggtgactttgcttctgg agccagtacttcatacttttcattgtacttcatacttttcattccaatggggtgactttgct tctggag SEQ ID PPE-1 Promoter NO: 17 gtacgtgtacttctgatcggcgatactagggagataaggatgtgcctgacaaaaccacattg ttgttgttatcattattatttagttttccttccttgctaactcctgacggaatctttctcac ctcaaatgcgaagtactttagtttagaaaagacttggtggaaggggtggtggtggaaaagta gggtgatcttccaaactaatctggttccccgcccgccccagtagctgggattcaagagcgaa gagtggggatcgtccccttgtttgatcagaaagacataaaaggaaaatcaagtgaacaatga tcagccccacctccaccccacccccctgcgcgcgcacaatacaatctatttaattgtacttc atacttttcattccaatggggtgactttgcttctggagaaactcttgattcttgaactctgg ggctggcagctagcaaaaggggaagcgggctgctgctctctgcaggttctgcagcggtctct gtctagtgggtgttttctttttcttagccctgcccctggattgtcagacggcgggcgtctgc ctctgaagttagccgtgatttcctctagagccgggtcttatctctggctgcacgttgcctgt gggtgactaatcacacaataacattgtttagggctggaatgaagtcagagctgtttaccccc actctataggggttcaatataaaaaggcggcggagaactgtccgagtcagaagcgttcctgc accggcgctgagagcctgacccggtctgctccgctgtccttgcgcgctgcctcccggctgcc cgcgacgctttcgccccagtggaagggccacttgctgcggccgc SEQ ID PPE-1-3X promoter NO: 18 gtacgtgtacttctgatcggcgatactagggagataaggatgtgcctgacaaaaccacattg ttgttgttatcattattatttagttttccttccttgctaactcctgacggaatctttctcac ctcaaatgcgaagtactttagtttagaaaagacttggtggaaggggtggtggtggaaaagta gggtgatcttccaaactaatctggttccccgcccgccccagtagctgggattcaagagcgaa gagtggggatcgtccccttgtttgatcagaaagacataaaaggaaaatcaagtgaacaatga tcagccccacctccaccccacccccctgcgcgcgcacaatacaatctatttaattgtacttc atacttttcattccaatggggtgactttgcttctggagaaactcttgattcttgaactctgg ggctggcagctagcctccagaagcaaagtcaccccattggaatgaaaagtatgaagtacaat gaaaagtatgaagtactggctccagaagcaaagtcaccctccagaagcaaagtcaccccatt ggaatgaaaagtatgaagtacgctagcaaaaggggaagcgggctgctgctctctgcaggttc tgcagcggtctctgtctagtgggtgttttctttttcttagccctgcccctggattgtcagac ggcgggcgtctgcctctgaagttagccgtgatttcctctagagccgggtcttatctctggct gcacgttgcctgtgggtgactaatcacacaataacattgtttagggctggaatgaagtcaga gctgtttacccccactctataggggttcaatataaaaaggcggcggagaactgtccgagtca gaagcgttcctgcaccggcgctgagagcctgacccggtctgctccgctgtccttgcgcgctg cctcccggctgcccgcgacgctttcgccccagtggaagggccacttgctgcggccgc SEQ ID ggtgactttg cttctggag NO: 22 SEQ ID ctccagaagcaaagtcacc NO: 23 SEQ ID gtacttcata cttttcatt NO: 24 SEQ ID aatgaaaagtatgaagtac NO: 25 SEQ ID Hypoxia Response element NO: 26 gcacgt

A cis-regulatory element for the present invention can be linked to a promoter upstream or downstream of the promoter or inserted between the two nucleotides in the promoter. The endothelial cell-specific promoter for the present invention can utilize any promoters known in the art. For example, suitable promoters which can be utilized for the present invention include the endothelial-specific promoters: preproendothelin-1 (PPE-1 promoter), US 2010/0282634, published Nov. 11, 2010; and WO 2011/083464, published Jul. 14, 2011); the PPE-1-3X promoter (U.S. Pat. No. 7,579,327, U.S. Pat. No. 8,071,740, U.S. Pat. No. 8,039,261, US2010/0282634, US 2007/0286845, WO 2011/083464, and WO2011/083466); the TIE-1 (S79347, S79346) and the TIE-2 (U53603) promoters [Sato T N, Proc Natl Acad Sci USA 1993 Oct. 15; 90(20):9355-8], the Endoglin promoter [Y11653; Rius C, Blood 1998 Dec. 15; 92(12):4677-90], the von Willerbrand factor [AF152417; Collins C J Proc Natl Acad Sci USA 1987 July; 84(13):4393-7], the KDR/flk-1 promoter [X89777, X89776; Ronicke V, Circ Res 1996 August; 79(2):277-85], The FLT-1 promoter [D64016 AJ224863; Morishita K,: J Biol Chem 1995 Nov. 17; 270(46):27948-53], the Egr-1 promoter [AJ245926; Sukhatme V P, Oncogene Res 1987 September-October; 1(4):343-55], the E-selectin promoter [Y12462; Collins T J Biol Chem 1991 Feb. 5; 266(4):2466-73], The endothelial adhesion molecules promoters: ICAM-1 [X84737; Horley K J EMBO J 1989 October; 8(10):2889-96], VCAM-1 [M92431; Iademarco M F, J Biol Chem 1992 Aug. 15; 267(23): 16323-9], PECAM-1 [AJ313330 X96849; CD31, Newman P J, Science 1990 Mar. 9; 247(4947): 1219-22], the vascular smooth-muscle-specific elements: CArG box X53154 and aortic carboxypeptidase-like protein (ACLP) promoter [AF332596; Layne M D, Circ Res. 2002; 90: 728-736] and Aortic Preferentially Expressed Gene-1 [Yen-Hsu Chen J. Biol. Chem, Vol. 276, Issue 50, 47658-47663, Dec. 14, 2001], all of which are incorporated herein by reference in their entireties.

In one embodiment, a promoter linked to the endothelial cell-specific element comprises a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% of SEQ ID NO: 17, wherein the promoter linked to the element induces endothelial cell-specificity to the gene operably linked to the promoter. In another embodiment, a promoter linked to the endothelial cell-specific element comprises a fragment, a variant, a derivative, or an analog of a wild-type PPE-1 promoter, wherein said fragment, variant, derivative, or analog thereof induces endothelial cell-specificity to the gene operably linked to the promoter. In one example, the endothelial cell-specific element can be inserted between nucleotide residues 442 and 449 corresponding to SEQ ID NO: 17.

In further embodiments, an endothelial cell-specific promoter comprises a hypoxia responsive element. A hypoxia responsive element (HRE) is located on the antisense strand of the endothelin-1 promoter. This element is a hypoxia-inducible factor-1 binding site that is required for positive regulation of the endothelin-1 promoter (of the human, rat and murine gene) by hypoxia. Hypoxia is a potent signal, inducing the expression of several genes including erythropoietin (Epo), VEGF, and various glycolytic enzymes. The core sequence (8 base pairs) is conserved in all genes that respond to hypoxic conditions and the flanking regions are different from other genes. The ET-I hypoxia responsive element is located between the GAT A-2 and the AP-1 binding sites. In one example, a hypoxia response element comprises SEQ ID NO: 26, a fragment, a variant, a derivative, or an analog thereof.

In other embodiments, an endothelial cell-specific promoter useful for the invention comprises, consists essentially of, or consists of a nucleotide sequence at least 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, or 100% of SEQ ID NO: 18, wherein the promoter linked to the cis-regulatory element induces endothelial cell-specificity to the gene operably linked to the promoter. In another embodiment, an endothelial cell-specific promoter comprises a fragment, a variant, a derivative, or an analog of SEQ ID NO: 18, wherein said fragment, variant, derivative, or analog thereof induces endothelial cell-specificity to the gene operably linked to the promoter.

Additional variations of the endothelial cell-specific promoters can be found at WO2011/083464, WO2011/083466, and WO2012/052423, which are incorporated herein by reference in their entireties.

The present invention also provides a novel promoter sequence comprising a nucleotide sequence SEQ ID NO: 17. In one example, the promoter further comprises an endothelial cell-specific cis-regulatory element. In one example, the endothelian cell-specific cis-regulatory element comprises SEQ ID NO: 11, SEQ ID NO: 12, SEQ ID NO: 13, SEQ ID NO: 14, SEQ ID NO: 15, SEQ ID NO: 16, SEQ ID NO: 22, SEQ ID NO: 23, SEQ ID NO: 24, SEQ ID NO: 25, SEQ ID NO: 26 or any fragments, derivatives, variants, or analogs thereof, wherein the fragments, derivatives, variants, or analogs thereof improve endothelial cell-specificity of the promoter compared to a promoter without the cis-regulatory element. In another example, the promoter comprises a nucleotide sequence of SEQ ID NO: 18. The invention includes a nucleic acid construct comprising the novel promoter and a heterologous nucleotide sequence. In one embodiment, the heterologous nucleic acid sequence comprises a nucleotide sequence encoding a FAS-chimera protein described herein. In another embodiment, the heterologous nucleotide sequence comprises an adenovirus sequence.

C. Vector

The invention also provides a vector comprising the nucleic acid construct, which comprises a FAS-chimera gene operably linked to an endothelial cell-specific promoter. For the purposes of this invention, numerous vector systems may be employed. For example, various viral gene delivery systems that can be used in the practice of this aspect of the invention include, but are not limited to, an adenoviral vector, an alphavirus vector, an enterovirus vector, a pestivirus vector, a lentiviral vector, a baculoviral vector, a herpesvirus vector, an Epstein Barr viral vector, a papovaviral vector, a poxvirus vector, a vaccinia viral vector, an adeno-associated viral vector and a herpes simplex viral vector.

In another embodiment, a vector comprising a FAS-chimera gene operably linked to an endothelial cell-specific promoter is an adenovirus. For example, the adenovirus can be any one or more of human adenovirus species A (serotypes 12, 18, and 31), B (serotpyes 3, 7, 11, 14, 16, 21, 34, 35, 50, and 55), C (serotypes 1, 2, 5, 6, and 57), D (8, 9, 10, 13, 15, 17, 19, 20, 22-30, 32, 33, 36-39, 42-49, 51, 53, 54, and 56), E (serotype 4), F (serotype 40 and 41), or G (serotype 52). In a particular embodiment, the adenovirus for the invention is human adenovirus serotype 5. In some embodiments, the adenovirus useful for gene therapy is a recombinant non-replicating adenovirus, which does not contain an E1 region and an E3 region. In certain embodiments, the adenovirus for the invention is a conditionally replicating adenovirus, which does not contain an E3 region, but contains an E1 region.

In one embodiment, the vector comprises, consists essentially of, or consists of SEQ ID NO: 19. In another embodiment, the adenovirus vector is an isolated virus having European Collection of Cell Cultures (ECACC) Accession Number 13021201.

D. Biological Deposits

Biological deposits were made with the European Collection of Cell Cultures (ECACC) located at Health Protection Agency Culture Collections, Health Protection Agency, Microbiology Services, Porton Down, Salisbury, SP4 0JG, UK, pursuant to the Budapest Treaty and pursuant to 37 C.F.R. §1.808. Samples of the deposited materials will become available to the public upon grant of a patent. The invention described and claimed herein is not to be limited by the scope of the strain deposited, since the deposited embodiment is intended only as an illustration of the invention.

Strain ECACC Accession No. Date Deposited VB-111 13021201 Feb. 12, 2013

III. VEGF Antagonists

VEGF, vascular endothelial growth factor, is an endothelial cell-specific mitogen and an inducer of angiogenesis. The term VEGF encompasses the members of the VEGF gene family: VEGF-A, VEGF-B, VEGF-C, and VEGF-D. VEGF-A is considered the prototype member of the VEGF gene family. Through alternative exon splicing, VEGF-A exists in four different isoforms: VEGF₁₂₁, VEGF₁₆₅, VEGF₁₈₉, and VEGF₂₀₆. The four VEGF-A isoforms are 121, 165, 189, and 206 amino acids in length (respectively) after signal sequence cleavage.

Once expressed, VEGF is secreted extracellularly where it binds to the extracellular region of a VEGF receptor (VEGFR). There are two primary VEGFRs, VEGFR-1 or VEGFR-2, both of which are receptor tyrosine kinases. A third VEGFR, VEGFR-3, is a related receptor tyrosine kinase that only binds VEGF-C and VEGF-D. Upon binding to VEGF, the VEGFRs signal downstream events that lead to endothelial cell proliferation and angiogenesis. VEGF-C and VEGF-D are known to regulate lymphatic angiogenesis.

The VEGF gene contains nucleotide sequences that are highly homologous to those of hypoxia-inducible factor-1 (HIF-1). These HIF-1 like sequences enable induction of VEGF gene expression under hypoxic conditions. Thus, under low oxygen conditions, such as within a tumor microenvironment, VEGF gene expression is induced. The production of high levels of VEGF within a tumor bed results in increased VEGFR signaling and thus endothelial cell growth and angiogenesis. The formation of new blood vessels within the tumor provides blood and oxygen to the growing tumor.

Due to the prominent role of VEGF in angiogenesis and tumor growth and development, VEGF antagonists are studied as potential cancer therapeutic agents. VEGF antagonists can prevent VEGF activity by binding directly to VEGF and blocking its interaction with a VEGFR. This reduces signaling from the VEGFR and downstream events, thereby causing a reduction in angiogenesis. In one embodiment, a VEGF antagonist useful for the invention is an anti-VEGF antibody or a VEGF binding molecule. In another embodiment, an anti-VEGF antibody or VEGF-binding molecule is a monoclonal antibody, a humanized antibody, a human antibody, a single chain antibody, or a chimeric antibody. In another embodiment, an anti-VEGF antibody or VEGF-binding molecule for the therapy comprises Fab, F(ab)₂, Fv, or scFv.

Another type of VEGF antagonist that can reduce or inhibit VEGF activity is a molecule binding to a VEGFR and thus blocking VEGFR interaction with VEGF. This interference of receptor/ligand binding prevents VEGFR signaling and reduces angiogenesis and endothelial cell proliferation. In one embodiment, the VEGF antagonist is an anti-VEGFR antibody or VEGFR-binding molecule. In another embodiment, the anti-VEGFR antibody or VEGFR-binding molecule is a monoclonal antibody, a humanized antibody, a human antibody, a single chain antibody, or a chimeric antibody. In another embodiment, the anti-VEGFR antibody or VEGFR-binding molecule comprises Fab, F(ab)₂, Fv, or scFv.

VEGF antagonists that bind to VEGF or VEGFR can inhibit VEGF activity by similar mechanisms of action in that they prevent receptor/ligand interaction, VEGFR signaling, and downstream signaling events such as endothelial cell proliferation and angiogenesis. Thus, in one embodiment, the VEGF antagonist is selected from the group consisting of bevacizumab (U.S. Pat. No. 7,169,901, incorporated herein by reference in its entirety), ranibizumab (U.S. Pat. No. 7,297,334, incorporated herein by reference in its entirety), VGX-100 (U.S. Pat. No. 7,423,125, incorporated herein by reference in its entirety), r84 (U.S. Pat. No. 8,034,905, incorporated herein by reference in its entirety), aflibercept (U.S. Pat. No. 5,952,199, incorporated herein by reference in its entirety), IMC-18F1 (U.S. Pat. No. 7,972,596, incorporated herein by reference in its entirety), IMC-1C11 (PCT/US2000/02180, incorporated herein by reference in its entirety), and ramucirumab (U.S. Pat. No. 7,498,414, incorporated herein by reference in its entirety). A VEGF binding molecule includes other forms of antibody derived molecules, e.g., a monobody, diabody, minibody, or any chimeric proteins comprising at least one CDR of a VEGF binding antibody, e.g., bevacizumab.

In one embodiment, the anti-VEGF antibody or VEGF binding molecule comprises at least one CDR selected from the group consisting of V_(H) CDR1 (SEQ ID NO: 28), V_(H) CDR2 (SEQ ID NO: 29), V_(H) CDR3 (SEQ ID NO: 30), V_(L) CDR1 (SEQ ID NO: 31), V_(L) CDR2 (SEQ ID NO: 32), V_(L) CDR3 (SEQ ID NO: 33), and any combination thereof. See Table 4.

TABLE 4 Amino Acid Sequences of Complementarity Determining Regions CDR Sequence V_(H) CDR1 (SEQ ID NO: 28) GYTFTNYGMN V_(H) CDR2 (SEQ ID NO: 29) WINTYTGEPTYAADFKR V_(H) CDR3 (SEQ ID NO: 30) YPHYYGSSHWYFDV V_(L) CDR1 (SEQ ID NO: 31) SASQDISNYLN V_(L) CDR2 (SEQ ID NO: 32) FTSSLHS V_(L) CDR3 (SEQ ID NO: 33) QQYSTVPWT

In another embodiment, the anti-VEGF antibody or the VEGF binding molecule comprises CDR1 (SEQ ID NO: 28), CDR2 (SEQ ID NO: 29), or CDR3 (SEQ ID NO: 30) of the heavy chain variable region (V_(H)) of bevacizumab. For example, an anti-VEGF antibody or VEGF binding molecule comprises CDR1 and CDR2 of V_(H), CDR 1 and CDR3 of V_(H), CDR2 and CDR3 of V_(H), or CDR1, CDR2, or CDR3 of V_(H). In other embodiments, the anti-VEGF antibody or the VEGF binding molecule comprises CDR1 (SEQ ID NO: 31), CDR2 (SEQ ID NO: 32), or CDR3 (SEQ ID NO: 33) of the light chain variable region (V_(L)) of bevacizumab. For example, an anti-VEGF antibody or VEGF-binding molecule comprises CDR1 and CDR2 of V_(L), CDR1 and CDR3 of V_(L), CDR2 and CDR3 of V_(L), or CDR1, CDR2, and CDR3 of V_(L). In some embodiments, an anti-VEGF antibody or VEGF binding molecule comprises V_(H) of bevacizumab. In certain embodiments, an anti-VEGF antibody or VEGF binding molecule comprises V_(L) of bevacizumab.

In another aspect of the present invention, the anti-VEGF antibody or VEGF binding molecule comprises V_(H) CDR1 (SEQ ID NO: 28), V_(H) CDR2 (SEQ ID NO: 29), V_(H) CDR3 (SEQ ID NO: 30), V_(L) CDR1 (SEQ ID NO: 31), V_(L) CDR2 (SEQ ID NO: 32), and V_(L) CDR3 (SEQ ID NO: 33).

IV. Treatment Methods Using Adenovirus Expressing Fas-Chimera Protein and a VEGF Antagonist

One embodiment of the present invention provides methods of inducing or improving responsiveness to a VEGF antagonist in a subject or a subject population in need thereof comprising administering a vector expressing a FAS chimera protein in combination with a VEGF antagonist.

In one aspect, the present invention includes a method of inhibiting or reducing angiogenesis to a subject or subject population in need of comprising (i) identifying a subject or subject population to be a candidate for improved responsiveness to a VEGF antagonist treatment and (ii) administering a vector encoding a Fas chimera protein and the VEGF antagonist to the subject or the subject population, wherein the subject or subject population has improved responsiveness to a VEGF antagonist after the administration of the vector.

In another aspect, the present invention includes a method of inhibiting or reducing angiogenesis to a subject or a subject population in need of induced or improved responsiveness to a VEGF antagonist comprising administering a vector encoding a Fas chimera protein and the VEGF antagonist to the subject or the subject population, wherein the subject or the subject population has improved responsiveness to a VEGF antagonist after the administration of the vector.

In other aspects, identifying a subject or a subject population to be a candidate for improved responsiveness to a VEGF antagonist comprises (a) administering a VEGF antagonist alone, (b) measuring responsiveness to the VEGF antagonist, (c) administering a vector encoding a Fas chimera protein, (d) administering the VEGF antagonist, (e) measuring responsiveness to the VEGF antagonist in (d), and (f) comparing the responsiveness in (b) with the responsiveness in (d). The subject or the subject population demonstrating a higher responsiveness in (e) than (b) can be identified as a subject in need of induced or improved responsiveness to the VEGF antagonist. The subject or the subject population demonstrating an equal responsiveness between (b) and (e) or a higher responsiveness in (b) than (e) can be identified as a non-candidate and can be excluded from further therapy.

In one embodiment, the invention is directed to a method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising administering a VEGF antagonist to the subject, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist and wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector. In another embodiment, the invention provides a method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising: (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, wherein the responsiveness of the subject to a VEGF antagonist is increased after administration of the vector, and (ii) administering the VEGF antagonist to the subject. In other embodiments, the invention includes a method of inducing apoptosis of an endothelial cell in a tumor of a subject in need thereof comprising (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, (ii) administering a VEGF antagonist to the subject, and (iii) measuring responsiveness of the subject to the VEGF antagonist, wherein the responsiveness of the subject is increased after the administration of the vector. In yet other embodiments, the tumor size of the subject is reduced after the administration of the VEGF antagonist.

In certain embodiments, the invention provides a method of reducing the size of a tumor in a subject in need thereof comprising administering a VEGF antagonist to the subject, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist, wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector and before administration of the VEGF antagonist, and wherein the tumor size in the subject is reduced after administration of the VEGF antagonist. In some embodiments, the invention provides a method of reducing the size of a tumor in a subject in need thereof comprising: (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, wherein the responsiveness of the subject to the VEGF antagonist is increased after the administration of the vector, and (ii) administering a VEGF antagonist to the subject, wherein the tumor size in the subject is reduced after administration of the VEGF antagonist. The present invention also includes a method of reducing the size of a tumor in a subject in need thereof comprising: (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, (ii) administering a VEGF antagonist to the subject; and (iii) measuring the responsiveness of the subject to the VEGF antagonist, wherein the responsiveness of the subject to the VEGF antagonist is increased after the administration of the vector. In other embodiments, the tumor size is reduced compared to the tumor size of a subject who is not administered with the vector prior to the administration of the VEGF antagonist. In yet other embodiments, the tumor size is measured by comparing the size of the tumor prior to the administration of the VEGF antagonist and the size of the tumor after the administration of the VEGF antagonist.

In certain embodiments, the invention includes a method of treating a disease or condition associated with tumor in a subject comprising administering a VEGF antagonist to a subject in need thereof, wherein the subject is administered with a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter prior to the administration of the VEGF antagonist and wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector and before administration of the VEGF antagonist. The invention is also directed to a method of treating a disease or condition associated with tumor in a subject comprising (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, wherein the responsiveness of the subject to a VEGF antagonist is increased after the administration of the vector, and (ii) administering the VEGF antagonist to the subject. In some embodiments, the invention provides a method of treating a disease or condition associated with tumor in a subject comprising (i) administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, (ii) administering a VEGF antagonist to the subject; and (iii) measuring responsiveness of the subject to the VEGF antagonist, wherein the responsiveness of the subject to the VEGF antagonist is increased after administration of the vector. In other embodiments, the tumor of the subject is progressed after the administration of the vector.

In some embodiments, the invention includes a method of identifying a candidate for a VEGF antagonist therapy comprising (i) measuring a tumor size of a subject who is diagnosed as having a tumor prior to administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter to the subject and (ii) measuring progression of the tumor after the administration of the vector, wherein the subject is identified as a candidate after the tumor is progressed. In other embodiments, the invention provides a method of identifying a candidate for a VEGF antagonist therapy comprising (i) measuring a tumor size of a subject who is diagnosed as having a tumor prior to administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter to the subject, (ii) measuring progression of the tumor after the administration of the vector, wherein the subject is identified as a candidate after the tumor is progressed, and (iii) instructing a healthcare provider to administer a VEGF antagonist to the subject. In certain aspects, the tumor progression is measured by the growth of the tumor. In some embodiments, clinical progression is assessed by clinical deterioration in the patients neurological signs and symptoms such as muscle weakness and mental status.

In a particular embodiment, the growth of the tumor is measured by MRI. In other embodiments, the tumor of the subject is a recurrent tumor that arose during treatment with the vector. In yet other embodiments, the tumor of the subject is a metastatic tumor that arose during treatment with the vector.

The term “subject” or “individual” or “animal” or “patient” or “mammal,” is meant any subject, particularly a mammalian subject, having or being expected to have increased or improved responsiveness to a VEGF antagonist. In some embodiments, the subject is meant any subject previously non-responsive to a VEGF antagonist, but becomes responsive to the VEGF antagonist after exposure to the vector. In one embodiment, the subject is a human. In another embodiment, the subject is a cancer patient.

The phrase “subject or subject population in need of induced or improved responsiveness to a VEGF antagonist” as used herein indicates that the subject or the subject population has been identified as a candidate or candidates for the combination therapy. The subject or subject population can be identified as being a candidate or candidates for the combination therapy prior to the administration of the vector or the VEGF antagonist.

In certain embodiments, identifying a candidate for the combination therapy comprises measuring various characteristics of tumor angiogenesis, for example, reduction in size of the tumor, inhibition of tumor growth, reduction in angiogenesis, reduction in neo-vascularization, or any known characteristics of angiogenesis.

In one aspect, the subject or the subject population in need of improved or induced responsiveness to a VEGF antagonist has a tumor or a metastasis thereof, wherein the VEGF antagonist and the vector treat, decrease, or reduce the size of a tumor or a metastasis thereof. In another aspect, the subject or the subject population in need of improved or induced responsiveness to a VEGF antagonist needs angiogenesis inhibition, wherein the vector and the VEGF antagonist treat, decrease, prevent, or reduce angiogenesis. In other aspects, the subject or the subject population in need of improved or induced responsiveness to a VEGF antagonist has cancer, wherein the vector and the VEGF antagonist treat cancer.

In certain aspects, once the subject or the subject population is identified as a candidate, the VEGF antagonist is administered prior to administering the vector, concomitantly with administration of a vector, or after administration of a vector. In other aspects, after a subject or a subject population is identified as a candidate, the vector is administered prior to the VEGF antagonist for at least one day earlier, at least two days earlier, at least three days earlier, at least four days earlier, at least five days earlier, at least six days earlier, at least seven days earlier, at least nine days earlier, at least 10 days earlier, at least two weeks earlier at least three weeks earlier, at least four weeks earlier, at least one month earlier, at least two months earlier, or more.

In one embodiment of the present invention, the invention includes a method of stabilizing a disease or disorder associated with cancer. In some embodiments, the invention includes a method of stabilizing a disease or disorder associated with metastatic colorectal cancer (mCRC), advanced nonsquamous non-small cell lung cancer (NSCLC), metastatic renal cell carcinoma (mRCC), glioblastoma multiforme (GBM), Müllerian cancer, ovarian cancer, peritoneal cancer, fallopian tube cancer, or uterine papillary serousspects, the present invention reduces the volume of malignant peritoneal fluid, e.g., ascites, reduces pain to the subject, prolongs survival of the subject, or any combinations thereof. The tumor that can be reduced, inhibited, or treated with the combination of the vector and the VEGF antagonist can be a solid tumor, a primary tumor, or a metastatic tumor. The term “metastatic” or “metastasis” refers to tumor cells that are able to establish secondary tumor lesions in another parts or organ.

A “solid tumor” includes, but is not limited to, sarcoma, melanoma, carcinoma, or other solid tumor cancer. “Sarcoma” refers to a tumor which is made up of a substance like the embryonic connective tissue and is generally composed of closely packed cells embedded in a fibrillar or homogeneous substance. Sarcomas include, but are not limited to, chondrosarcoma, fibrosarcoma, lymphosarcoma, melanosarcoma, myxosarcoma, osteosarcoma, Abemethy's sarcoma, adipose sarcoma, liposarcoma, alveolar soft part sarcoma, ameloblastic sarcoma, botryoid sarcoma, chloroma sarcoma, chorio carcinoma, embryonal sarcoma, Wilms' tumor sarcoma, endometrial sarcoma, stromal sarcoma, Ewing's sarcoma, fascial sarcoma, fibroblastic sarcoma, giant cell sarcoma, granulocytic sarcoma, Hodgkin's sarcoma, idiopathic multiple pigmented hemorrhagic sarcoma, immunoblastic sarcoma of B cells, lymphoma, immunoblastic sarcoma of T-cells, Jensen's sarcoma, Kaposi's sarcoma, Kupffer cell sarcoma, angiosarcoma, leukosarcoma, malignant mesenchymoma sarcoma, parosteal sarcoma, reticulocytic sarcoma, Rous sarcoma, serocystic sarcoma, synovial sarcoma, or telangiectaltic sarcoma.

The term “melanoma” refers to a tumor arising from the melanocytic system of the skin and other organs. Melanomas include, for example, acra-lentiginous melanoma, amelanotic melanoma, benign juvenile melanoma, Cloudman's melanoma, S91 melanoma, Harding-Passey melanoma, juvenile melanoma, lentigo maligna melanoma, malignant melanoma, metastatic melanoma, nodular melanoma, subungal melanoma, or superficial spreading melanoma.

The term “carcinoma” refers to a malignant new growth made up of epithelial cells tending to infiltrate the surrounding tissues and give rise to metastases. Exemplary carcinomas include, for example, acinar carcinoma, acinous carcinoma, adenocystic carcinoma, adenoid cystic carcinoma, carcinoma adenomatosum, carcinoma of adrenal cortex, alveolar carcinoma, alveolar cell carcinoma, basal cell carcinoma, carcinoma basocellulare, basaloid carcinoma, basosquamous cell carcinoma, bronchioalveolar carcinoma, bronchiolar carcinoma, bronchogenic carcinoma, cerebriform carcinoma, cholangiocellular carcinoma, chorionic carcinoma, colloid carcinoma, comedo carcinoma, corpus carcinoma, cribriform carcinoma, carcinoma en cuirasse, carcinoma cutaneum, cylindrical carcinoma, cylindrical cell carcinoma, duct carcinoma, carcinoma durum, embryonal carcinoma, encephaloid carcinoma, epiermoid carcinoma, carcinoma epitheliale adenoides, exophytic carcinoma, carcinoma ex ulcere, carcinoma fibrosum, gelatiniform carcinoma, gelatinous carcinoma, giant cell carcinoma, carcinoma gigantocellulare, glandular carcinoma, granulosa cell carcinoma, hair-matrix carcinoma, hematoid carcinoma, hepatocellular carcinoma, Hurthle cell carcinoma, hyaline carcinoma, hypemephroid carcinoma, infantile embryonal carcinoma, carcinoma in situ, intraepidermal carcinoma, intraepithelial carcinoma, Krompecher's carcinoma, Kulchitzky-cell carcinoma, large-cell carcinoma, lenticular carcinoma, carcinoma lenticulare, lipomatous carcinoma, lymphoepithelial carcinoma, carcinoma medullare, medullary carcinoma, melanotic carcinoma, carcinoma molle, mucinous carcinoma, carcinoma muciparum, carcinoma mucocellulare, mucoepidermoid carcinoma, carcinoma mucosum, mucous carcinoma, carcinoma myxomatodes, naspharyngeal carcinoma, oat cell carcinoma, carcinoma ossificans, osteoid carcinoma, papillary carcinoma, periportal carcinoma, preinvasive carcinoma, prickle cell carcinoma, pultaceous carcinoma, renal cell carcinoma of kidney, reserve cell carcinoma, carcinoma sarcomatodes, schneiderian carcinoma, scirrhous carcinoma, carcinoma scroti, signet-ring cell carcinoma, carcinoma simplex, small-cell carcinoma, solanoid carcinoma, spheroidal cell carcinoma, spindle cell carcinoma, carcinoma spongiosum, squamous carcinoma, squamous cell carcinoma, string carcinoma, carcinoma telangiectaticum, carcinoma telangiectodes, transitional cell carcinoma, carcinoma tuberosum, tuberous carcinoma, verrucous carcinoma, or carcinoma viflosum.

Additional cancers that may be inhibited or treated include, for example, Leukemia, Hodgkin's Disease, Non-Hodgkin's Lymphoma, multiple myeloma, neuroblastoma, breast cancer, ovarian cancer, lung cancer, rhabdomyosarcoma, primary thrombocytosis, primary macroglobulinemia, small-cell lung tumors, primary brain tumors, stomach cancer, colon cancer, malignant pancreatic insulanoma, malignant carcinoid, urinary bladder cancer, premalignant skin lesions, testicular cancer, lymphomas, thyroid cancer, papillary thyroid cancer, neuroblastoma, neuroendocrine cancer, esophageal cancer, genitourinary tract cancer, malignant hypercalcemia, cervical cancer, endometrial cancer, adrenal cortical cancer, prostate cancer, Müllerian cancer, ovarian cancer, peritoneal cancer, fallopian tube cancer, or uterine papillary serous carcinoma.

In other embodiments, the subject has had up to three, up to two, or up to one previous line of chemotherapy. In yet other embodiments, the subject has not had more than 3 prior lines of chemotherapy for recurrent cancer.

In certain embodiments, the invention provides a method for inducing or improving responsiveness to a vascular endothelial growth factor (VEGF) antagonist in a subject or a subject population in need thereof, comprising administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, and the VEGF antagonist to the subject or the subject population, wherein the responsiveness to the VEGF antagonist is induced or improved after the administration of the vector compared to the responsiveness to the VEGF antagonist without the administration of the vector.

In certain embodiments, once the subject or the subject population is identified as a candidate, the method further comprises administering repeated doses of the VEGF antagonist and the vector.

The dose of the vector administered as part of the present invention can be measured in virus particles (VPs). In one embodiment, the dose of the vector in the combination therapy with bevacizumab is lower than the dose that is used for the therapy without bevacizumab (e.g., a therapy using the vector alone). For example, an effective amount of the vector in the combination therapy with bevacizumab includes, but is not limited to equal to or less than about 1×10¹³, 9×10¹², 8×10¹², 7×10¹², 6×10¹², 5×10¹², 4×10¹², 3×10¹², 2×10¹², 1×10¹², 9×10¹¹, 8×10¹¹, 7×10¹¹, 6×10¹¹, 5×10¹¹, 4×10¹¹ 3×10¹¹, 2×10¹¹, 1×10¹¹, 9×10¹⁰, 8×10¹⁰, 7×10¹⁰, 6×10¹⁰, 5×10¹⁰, 4×10¹⁰, 3×10¹⁰, 2×10¹⁰, or 1×10¹⁰ virus particles.

In one embodiment, the vector is administered at an effective amount of at least about 1×10¹¹ virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹² virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹³ virus particles. In another embodiment, the vector is administered at an effective amount of at least about 1×10¹⁴ virus particles. In other embodiments, the vector is administered at an effective amount of at least about 1×10⁷, 1×10⁸, 1×10⁹, 1×10¹⁰, or 5×10¹⁰ virus particles.

The dose of the VEGF antagonist (e.g., bevacizumab) can be measured in mg/kg body weight. In one aspect, the dose of bevacizumab in the combination therapy with the vector is lower than the dose of bevacizumab without the vector (e.g., a therapy using bevacizumab alone). Non-limiting examples of an effective amount of bevacizumab include equal to or less than about 15 mg/kg, 14 mg/kg, 13 mg/kg, 12 mg/kg, 11 mg/kg, 10 mg/kg, 9 mg/kg, 8 mg/kg, 7 mg/kg, 6 mg/kg, 5 mg/kg, 4 mg/kg, 3 mg/kg, 2 mg/kg, or 1 mg/kg.

In a specific embodiment, the vector is administered at an effective amount of 3×10¹² to 1×10¹³ VPs and bevacizumab is administered at an effective amount of 5 mg/kg to 15 mg/kg.

The present invention provides methods of inducing or improving responsiveness to VEGF antagonists comprising administering a vector and a VEGF antagonist. The regimen used for administering the vector and the VEGF antagonist comprises repeated administration of the vector and the bevacizumab. In one embodiment, the vector is repeatedly administered every day, once in about 2 days, once in about 3 days, once in about 4 days, once in about 5 days, once in about 6 days, once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 5 weeks, once in about 6 weeks, once in about 7 weeks, once in about 2 months, or once in about 6 months. In another embodiment the bevacizumab is repeatedly administered once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 2 months, once in about 3 months, once in about 4 months, once in about 5 months, or once in about 6 months. In a particular embodiment, the vector is administered every 2 months and bevacizumab is administered every 2 weeks.

V. Pharmaceutical Compositions

Also provided in the invention is a pharmaceutical composition comprising a vector expressing a FAS-chimera protein used in the methods of the invention. The pharmaceutical composition can be formulated for administration to mammals, including humans. The pharmaceutical compositions used in the methods of this invention comprise pharmaceutically acceptable carriers, including, e.g., ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-based substances, polyethylene glycol, sodium carboxymethylcellulose, polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers, polyethylene glycol and wool fat. In one embodiment, the composition is formulated by adding saline.

The compositions of the present invention may be administered by any suitable method, e.g., parenterally (e.g., includes subcutaneous, intravenous, intramuscular, intra-articular, intra-synovial, intrasternal, intrathecal, intrahepatic, intralesional and intracranial injection or infusion techniques), intraventricularly, orally, by inhalation spray, topically, rectally, nasally, buccally, vaginally or via an implanted reservoir. As described previously, the composition comprising a nucleic acid construct which comprises a FAS-chimera gene in an endothelial cell and thereby induces apoptosis of the endothelial cell. Accordingly, the composition can inhibit, reduce, or decrease the size of a tumor or a metastasis thereof by inhibiting neo-vascularization and/or angiogenesis of the tumor endothelial cells. Likewise, the VEGF antagonist used in combination with the nucleic acid construct inhibit neo-vascularization and/or angiogenesis through direct inhibition of VEGF activity. Therefore, in one embodiment, the combination therapy is delivered systemically or locally. For systemic or local delivery, the pharmaceutical formulation containing the nucleic acid construct, the adenovirus, or the homogeneous population of the adenovirus can utilize a mechanical device such as a needle, cannula or surgical instruments.

Sterile injectable forms of the compositions used in the methods of this invention may be aqueous or oleaginous suspension. These suspensions may be formulated according to techniques known in the art using suitable dispersing or wetting agents and suspending agents. The sterile, injectable preparation may also be a sterile, injectable solution or suspension in a non-toxic parenterally acceptable diluent or solvent, for example as a suspension in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil may be employed including synthetic mono- or di-glycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, such as carboxymethyl cellulose or similar dispersing agents which are commonly used in the formulation of pharmaceutically acceptable dosage forms including emulsions and suspensions. Other commonly used surfactants, such as Tweens, Spans and other emulsifying agents or bioavailability enhancers which are commonly used in the manufacture of pharmaceutically acceptable solid, liquid, or other dosage forms may also be used for the purposes of formulation.

Parenteral formulations may be a single bolus dose, an infusion or a loading bolus dose followed with a maintenance dose. These compositions may be administered at specific fixed or variable intervals, e.g., once a day, or on an “as needed” basis.

Certain pharmaceutical compositions used in the methods of this invention may be orally administered in an acceptable dosage form including, e.g., capsules, tablets, aqueous suspensions or solutions. Certain pharmaceutical compositions also may be administered by nasal aerosol or inhalation. Such compositions may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, and/or other conventional solubilizing or dispersing agents.

An effective amount of the chemotherapeutic agent is available in the art. In one aspect, for example, an effective amount of bevacizumab can be at least about 1 mg/kg, 2 mg/kg, 3 mg/kg, 4 mg/kg, or 5 mg/kg.

EXAMPLES Example 1 Construction and Cloning of the Viral Vector

The vector was constructed using a backbone containing most of the genome of adenovirus type 5, as well as partial homology to an adaptor plasmid, which enables recombination.

The E1 early transcriptional unit was deleted from the backbone plasmid, and further modified by deleting the pWE25 and the Amp resistance selection marker site.

The adaptor plasmid, containing sequences of the Ad5, CMV promoter, MCS, and SV40 polyA was modified to delete deleting the CMV promoter, and the PPE-1 promoter and Fas-c fragment were inserted by restriction digestion. The modified PPE-1 promoter (PPE-1-3X, SEQ ID NO: 18) and the Fas-chimera transgene (Fas-c, SEQ ID NO: 9) were utilized for construction of the adenoviral vector. The PPE-1-(3X)-Fas-c element (2115 bp) was constructed from the PPE-1-(3X)-luc element. This element contains the 1.4 kb of the murine preproendothelin PPE-1-(3X) promoter, the Luciferase gene, the SV40 polyA site and the first intron of the murine ET-1 gene, originated from the pEL8 plasmid (8848 bp) used by Harats et al (Harats D. et al., JCI, 1995). The PPE-3-Luc cassette was extracted from the pEL8 plasmid using the BamHI restriction enzyme. The Luciferase gene was substituted by the Fas-c gene [composed of the extra cellular and intra membranal domains of the human TNF-R1 (Tumor Necrosis Factor Receptor 1, SEQ ID NO: 4) and of the Fas (p55) intracellular domain (SEQ ID NO: 8) (Boldin et al, JBC, 1995)] to obtain the PPE-1-3x-Fas-c cassette.

PPE-1 (3x)-Fas-c Plasmid—The cassette was further introduced into the backbone plasmid by restriction digestion, resulting with the PPE-1 (3x)-Fas-c plasmid.

Adaptor-PPE-1(3x)-Fas-c Plasmid—The PPE-1-3x-Fas-c element was extracted from the first generation construct PPE-1-3x-Fas-c plasmid, and was amplified with designated PCR primers introducing SnaB1 and EcoR1 restriction sites at the 5′-and-3′-end respectively. These sites were used to clone the PPE-Fas-c fragment into the adaptor plasmid digested with SnaB1 and EcoR1, resulting in the adaptor-PPE-1-3x-Fas-c used for transfection of the host cells (for example, PER.C6 cells).

Example 2 Administration of Bevacizumab to Patients Previously Treated with Ad5-PPE-1-3X-Fas-c

OBJECTIVES: The objectives of this study are: (i) to evaluate the safety, tolerability, and efficacy of single and multiple doses of VB-111 (1×10¹², 3×10¹², 1×10¹³ viral particles [VP]) in patients with recurrent glioblastoma multiforme (GBM); (ii) to evaluate the distribution of VB-111 after single and multiple IV infusions and the level of antibodies to the adenovirus vector; and (iii) to evaluate the safety, tolerability, and efficacy of combination treatment of multiple doses of VB-111 (3×10¹², or 1×10¹³ viral particles) together with bevacizumab in patients with recurrent GBM. An example of such a treatment regimen is shown in FIG. 1.

VB-111 and bevacizumab are both anti-angiogenic agents that target the tumor vasculature. However, they do so based on two distinct MOAs: Bevacizumab antagonizes VEGF while VB-111 directly disrupts the angiogenic vessels.

Patient Selection Inclusion Criteria

Subjects must have a histologically confirmed diagnosis of glioblastoma multiforme or gliosarcoma. Subjects with recurrent disease whose diagnostic pathology confirmed glioblastoma multiforme or gliosarcoma will not need re-biopsy;

Measurable disease by RANO criteria (see Screening, Day −21-0); see also Table 8 in Example 4;

Subjects≧18 years of age;

Disease progression or recurrence following standard of care treatment with temozolomide and radiation;

An interval of at least 4 weeks between prior surgical resection and study enrollment;

An interval of at least 12 weeks between prior radiotherapy or at least 4 weeks from prior chemotherapy, and enrollment in this protocol;

Recovered to Grade 1 or less from the toxic effects of any earlier intervention;

Karnofsky performance status of at least 60%;

Adequate renal, liver, and bone marrow function according to the following criteria:

-   -   Absolute neutrophil count ≧1500 cells/ml     -   Platelets ≧125,000 cells/ml     -   Total bilirubin within upper limit of normal (ULN)     -   Aspartate aminotransferase (AST)≦2.5 X institutional ULN     -   Creatinine less than or equal to the ULN or creatinine clearance         ≧50 mL/min for patients with creatinine levels above normal         limits. (creatinine clearance calculated by the Cockcroft-Gault         formula, see Appendix II).     -   PT, PTT (in seconds) prolonged beyond >20% of the upper limits         of normal.

Subjects must be treated with corticosteroids on day 0. Subjects already administering steroids must be on a stable dose for at least 1 week prior to entry with no anticipation of a need to increase the steroid dose throughout the study;

Ability to understand and willingness to sign a written informed consent document;

Males and females of childbearing potential must utilize a standard contraception method throughout the course of the trial.

Cohorts 1 and 2 Additional Eligibility Criteria:

Subjects without major mass effect of tumor (defined as <5 mm shift, no herniation).

Cohorts 3-4 Additional Eligibility Criteria for Further Dosing:

Subject received VB-111 at least 2 months ago, and remains without evidence of disease progression for at least 2 months after dosing. Note: Subjects that received the first dose more than 2 months prior to approval of this multiple dose amendment, may be eligible to receive the 2nd dose later than 2 months after the first dose, provided they remain with stable disease. Subjects who progressed later than 2 months after the baseline dose may be eligible for the compassionate use protocol VB-111-122-CU. Subjects who progress earlier than 2 months post dosing will discontinue the study.

Subjects who experienced a VB-111 drug related adverse event, and are scheduled for a repeat dose, the repeat dose will be delayed until the severity of the event is no more than CTCAE Grade 1.

Subjects who experienced a prolongation of PTT and are scheduled for a repeat dose, the repeat dose will be delayed until the PTT has normalized returned to within 20% of the baseline value, whether any positive LAC or APLA test has normalized or not. Subjects with clinically significant thrombotic or bleeding events related to a prolonged PTT should not receive additional doses of VB-111.

Exclusion Criteria

Prior anti-angiogenic therapy including VEGF sequestering agents (ie bevacizumab, aflibercept, etc) or VEGFR inhibitors (cedirinib, pazopanib, sunitinib, sorafenib, etc);

Prior stereotactic radiotherapy;

Pregnant or breastfeeding subjects;

Concomitant medication that may interfere with study results; e.g. immunosuppressive agents other than corticosteroids;

Active infection;

Evidence of CNS haemorrhage CTCAE grade 2 or above on baseline MRI;

Expected to have surgery during study period;

Subjects who suffered from an acute cardiac event within the last 12 months;

Subjects with active vascular disease, either myocardial or peripheral (i.e. acute coronary syndrome, cerebral stroke, transient ischemic attack or arterial thrombosis or symptomatic peripheral vascular disease within the past 3 months);

Subjects with known proliferative and/or vascular retinopathy;

Subjects with known liver disease (alcoholic, drug/toxin induced, genetic, or autoimmune);

Subjects with known active second malignancy;

Subjects testing positive to one of the following viruses: HIV, HBV and HCV;

Subjects that have undergone major surgery within the last 4 weeks before enrollment;

Subjects may not have received any other investigational agent within 4 weeks before enrollment;

Uncontrolled intercurrent illness including, but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.

Bevacizumab-Specific Exclusion Criteria

Inadequately controlled hypertension (defined as systolic blood pressure >150 mmHg and/or diastolic blood pressure >100 mmHg) within 28 days of first study treatment;

Prior history of hypertensive crisis, hypertensive encephalopathy, reverse posterior leukoencephalopathy syndrome (RPLS);

Prior history of gastrointestinal perforation or abscess;

Clinically significant (i.e. active) cardiovascular disease, for example cerebrovascular accidents ≦6 months prior to study enrollment, myocardial infarction ≦6 months prior to study enrollment, unstable angina, New York Heart Association (NYHA) Grade II or greater congestive heart failure (CHF), or serious cardiac arrhythmia uncontrolled by medication or potentially interfering with protocol treatment;

History or evidence upon physical/neurological examination of central nervous system disease (e.g. seizures) unrelated to cancer or potentially interfering with protocol treatment (unless adequately controlled by medication);

Significant vascular disease (e.g., aortic aneurysm requiring surgical repair or recent arterial thrombosis) within 6 months prior to start of study treatment. Any previous venous thromboembolism >NCI common toxicity criteria adverse event (CTCAE) Grade 3;

History of pulmonary hemorrhage/hemoptysis ≧grade 2 (defined as ≧2.5 mL bright red blood per episode) within 1 month of first study treatment;

History or evidence of inherited bleeding diathesis or significant coagulopathy at risk of bleeding (i.e. in the absence of therapeutic anticoagulation);

Current or recent (within 10 days of study enrollment) use of aspirin (>325 mg/day), clopidogrel (>75 mg/day) or equivalent. Prophylactic use of anticoagulants is allowed;

Surgical procedure (including open biopsy, surgical resection, wound revision, or any other major surgery involving entry into a body cavity) or significant traumatic injury within 28 days prior to first study treatment, or anticipation of need for major surgical procedure during the course of the study;

Minor surgical procedure, e.g. stereotactic biopsy, within 7 days of first study treatment; placement of a vascular access device, within 2 days of first study treatment;

History of intracranial abscess within 6 months prior to first study treatment;

History of active gastrointestinal bleeding within 6 months prior to first study treatment;

Serious, non-healing wound, active ulcer, or untreated bone fracture;

Known hypersensitivity to any component of bevacizumab or any of the study drugs.

Proteinuria at screening as demonstrated by either:

-   -   Urine protein: creatinine (UPC) ratio ≧1.0 at screening OR     -   Urine dipstick for proteinuria ≧2+ (patients discovered to have         ≧2+ proteinuria on dipstick urinalysis at baseline should         undergo a 24 hour urine collection and must demonstrate ≦1 g of         protein in 24 hours to be eligible)

Treatment Plan

This will be a prospective, open label, dose escalating, multi-center, Phase 1/2 study, measuring the safety, tolerability, distribution, and efficacy of single or multiple doses of intravenously administered VB-111 in patients with recurrent GBM.

Dose Cohorts

VB-111 will be administered as a single intravenous infusion of 1×10¹² (Cohort 1) or 3×10¹² VP (Cohort 2), or multiple intravenous infusions consisting of an initial infusion of 3×10¹² followed by subsequent infusions of 1×10¹³ (Cohort 3) or multiple intravenous infusions of 1×10¹³ (Cohort 4).

Eligible, consenting patients will be enrolled into one of four sequential dosing cohorts as follows:

TABLE 5 Dosing Plan Cohort VB-111 (vp) Patients No. 1 1 × 10¹² Single Dose 3-6 2 3 × 10¹² Single Dose 3-6 3 3 × 10¹² Initial Dose + 1 × 10¹³ Minimum of 3 Repeat Dose Maximum of 29 4 1 × 10¹³ Multiple Doses Maximum of 49 3-4 EXT 1 × 10¹³(Q2 months) + 10 mg/kg Maximum of 29 bevacizumab (Q2 weeks)

The study will be conducted according to the Simon's 2 step method. Up to 90 subjects are anticipated to enroll in this study, with up to 29 subjects in Cohort 3, and up to 49 subjects in Cohort 4.

Step one will include the first 10 evaluable patients at the 1×10¹³ VP dose level or MTD.

For efficacy analysis, evaluable patients will be defined as those who received at least one repeat dose of 1×10¹³ VPs or of MTD, or patients who progressed sooner than 2 months after an initial dose of 1×10¹³ VPs.

A subject will be considered to have a response if s/he is either alive and progression free at 6 months or has at least a partial tumor response according to Rano criteria within 6 months post dosing. If less than 2 responses are observed in the step 1 subjects, step 2 will be halted, otherwise, an additional 19 subjects will enroll in step 2.

Dose Escalation and Dose-Limiting Toxicity

Toxicities will be graded according to the NCI common toxicity criteria Version 4.0. Dose limiting toxicity (DLT) is any grade 3 or higher toxicity judged drug-related that does not respond to maximal medical therapy.

Cohorts 1 & 2:

Three subjects were enrolled sequentially to receive 1×10¹² (cohort 1) and observed for 28 days for DLT monitoring. No DLTs occurred in cohort 1 and the study proceeded with cohort 2.

Three subjects were enrolled sequentially to receive 3×10¹² (cohort 2) and observed for 28 days for DLT. No DLTs were reported in cohort 2 and the study proceeded to cohort 3.

Cohort 3:

Study subjects were initially enrolled into this cohort to receive a single dose. Upon approval of Protocol Version 6.0, subjects remaining stable began to receive bi-monthly doses of VB-111 following establishment of safety with repeat doses at a rate of 1×10¹³ VPs.

Cohort 4:

Study subjects will be enrolled sequentially into the multiple dose cohort 4 and will receive VB-111 at 1×10¹³ VPs every 2 months.

Cohorts 3-4 EXT:

Upon disease progression, subjects will receive a combination of VB-111 and bevacizumab. The first subjects receiving this combination treatment will be monitored for DLTs according to the following:

Stage 1: A minimum of 3 subjects will receive bi-monthly doses of VB-111 (3×10¹² VPs) and bi-weekly bevacizumab (10 mg/Kg). Stage 2: A minimum of 3 subjects will receive bi-monthly doses of VB-111 (1×10¹³ VPs) and bi-weekly bevacizumab (10 mg/Kg).

Refer to Monitoring for Dose Limiting Toxicities below for details on DLT monitoring in Cohorts 3-4.

Monitoring for Dose Limiting Toxicities:

Monitoring for DLTs was performed to establish safety at the beginning of each dose level escalation (Cohorts 1-4; 1×10¹²-1×10¹³ VPs). No DLTS were observed in this study to date, therefore, the study has proceeded as planned.

For Cohort 3-4 EXT:

Stage 1: Upon each local IRB approval of this protocol amendment (7.0), the first three subjects who progress after receiving at least one dose of 1×10¹³ VPs (initial or repeat) will receive a combination of a reduced dose of VB-111 (3×10¹² VPs) and bevacizumab (10 mg/kg). These subjects will be monitored for DLTs following this first combination dose.

[Since a minimum of 2 months is required between doses of VB-111, if a subject progresses before 2 months, the subject will begin treatment with bevacizumab (10 mg/kg) every 2 weeks and at 2 months from the last dose of VB-111, the subject will receives the 3×10¹² VPs dose of VB-111.]

Among the first 3 subjects enrolled, if 1 DLT is observed within 4 weeks following the initial combination dose, 3 additional subjects will receive a combination dose, and safety will be reassessed.

If two out of six subjects who have received a combination dose of VB-111 (3×10¹² VPs) and bevacizumab (10 mg/kg) experience a DLT, dosing in the Cohort 3-4 EXT shall stop and all progressed subjects will be followed for long term follow up and survival.

If no DLTs are observed or only 1 DLT is observed in 6 patients, further dosing will escalate to Stage 2 levels: VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/kg), see below.

Three subjects were enrolled sequentially and received 3×10¹² VPs and bevacizumab (10 mg/kg) and observed for 28 days for DLTs. No DLTS were observed in this study to date, therefore, the study proceeded as planned to Stage 2 combination therapy: VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/kg), see below.

Stage 2:

DLT monitoring will be performed for a minimum of 3 subjects for 4 weeks from the first combination dose of VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/Kg).

Among the first 3 subjects enrolled at Stage 2 dosing, if 1 DLT is observed within 4 weeks following the initial combination dose, 3 additional subjects receive a combination dose, and safety will be reassessed.

If two out of six subjects who have received a combination dose of VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/kg) experience a DLT, all future doses in the Cohort 3-4 EXT shall be reduced to VB-111 at 3×10¹² VPs and bevacizumab (10 mg/kg).

If no DLTs are observed or only 1 DLT is observed in 6 patients, all future Cohort 3-4 EXT dosing will proceed as planned: VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/kg).

In order to allow sufficient time to monitor for DLTs, scheduling of combination doses will require prior approval from VBL.

Three subjects were enrolled sequentially and received 1×10¹³ VPs and bevacizumab (10 mg/kg) and observed for 28 days for DLTs. No DLTS were observed in this study to date, therefore, all subjects proceeded to receive combined therapy of VB-111 (1×10¹³ VPs) and bevacizumab (10 mg/kg).

Study Visits Screening, Day −21-0

Prospective patients will be screened within 3 weeks of enrollment. As a patient is screened, he/she will be given a Patient Identification Number (PIN) by the site study coordinator, which will be recorded in a patient screening log, and will be assessed for eligibility according to the protocol selection criteria. Patients who meet the eligibility criteria will be offered a choice of participation. The PIN consists of the center-number (e.g. 01) plus the patient number in sequential order (e.g. 001, 002, 003, etc.), so the full PIN for center 1 will be 01001, 01002, etc.

Patients will be informed of the advantages, risks and constraints of the study and will be asked to sign an informed consent form.

Patients will then be evaluated by medical history, physical examination and laboratory assessment including ECG. The screening procedures will also include recording the patient's height, weight, date of birth, sex and race.

Medical History: A routine medical history and physical examination will be carried out within 4 weeks prior to enrollment. Baseline laboratory evaluations are to be conducted within 4 weeks prior to start of protocol therapy and at the baseline visit prior to initiation of therapy. Medical history will focus on previous and/or known illnesses, including possible known infections, such as HBV, HIV, HCV, or other infections within the last month, cardiac disease, and liver disease. Medications taken on a regular basis, including those taken in the last month will be recorded. Chemotherapy and radiotherapy and/or immune suppressive treatments taken in the previous 12 weeks will be recorded, as well as surgeries done within this time period. Women are asked for pregnancy and breastfeeding status.

Karnofsky Performance Status (KPS) and ECOG should be performed at Screening.

Physical Examination:

Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; and Neurologic.

Physical Examination should include collection of height and weight (at screening visit only).

ECG: A standard 12-lead electrocardiogram with rhythm strip should be performed.

Laboratory Analyses: Blood: Blood will be collected at a fasting state and analyzed for the following:

-   -   Hematology: complete blood count with INR, PT and activated PTT     -   Chemistry: electrolytes, creatinine and blood urea, bilirubin,         alkaline phosphatase, ALT and AST; calcium, total protein, and         albumin,     -   Virus infection tests: HIV, HBV and HCV     -   A serum pregnancy test will be conducted in female patients with         childbearing potential

Urine: Routine urinalysis will be collected and analyzed with microscopic examination on positives

Vital Signs: The vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, temperature, respiration rate) will be recorded at screening.

Tumor Measure: Contrast and non-contrast brain MRI imaging will be done at screening and within 72 hours of the baseline visit to assess extent of cancer. If there are less than 2 weeks between screening and baseline visits, only 1 MRI will be required.

Pregnancy: Eligible female subjects will be informed of special restrictions with regards to pregnancy and breast feeding throughout the study period. Both male and female subjects will commit to use one standard contraceptive method on a regular basis throughout the study period starting from screening. Both men and women should not attempt pregnancy and women should not be pregnant or breast-feeding while participating in this study. If sexually active, both men and women should use an effective method of birth control from the screening visit and for up to one year after treatment. Barrier contraceptives (condoms or diaphragms) with spermicide, intrauterine devices, hormonal contraceptives (Depo-Provera, Norplant), oral contraceptive pills, and complete abstinence are examples of effective methods.

Final Patient Selection: The final decision about the eligibility of the patient to be enrolled is to be made after all screening evaluations are available. All inclusion and exclusion criteria MUST be met. The reason for all screen failures will be captured via the Screening Log.

Baseline (Study Drug Administration), Day 0

VB-111 will be administered as an outpatient. Once the subject is found eligible, he/she will be appointed to arrive at the clinic within 3 weeks from screening in a fasting state until 30 minutes following study drug administration.

Prior to dosing (D0): On the day of admission to the site, each subject will be verified for eligibility according to inclusion/exclusion criteria (where applicable) and then tested within 24 hours prior to dosing for the following evaluations.

Laboratory Analyses (According to the Operation Manual):

Blood samples will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT;     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Angiogenic Biomarker/Cytokine samples:         -   Levels of von Willebrand factor (vWF) and TNFα (optional).         -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF,             FGF, IL-6, IL-8, E-selectin, ICAM-1

Urine will be collected for the following evaluations:

-   -   Routine urine analysis     -   Cohorts 1-2 only: Biodistribution (VB-111 adenovirus DNA levels)

Vital Signs: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

Anti-Pyretic Treatment: To avoid fever following study drug administration, all patients will receive 1000 mg of acetaminophen starting 1-2 hours prior to dosing followed by 500 mg PRN 24 hours.

Corticosteroid Treatment: To reduce potential edema response during drug administration, dexamethasone treatment will be administered:

Initial dose with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 14 days post dosing. Subsequent doses with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion. If subjects begin the study already on steroids, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

Study Drug Administration: Drug preparation and Infusion will be done according to the operation manual. Maximum time for drug in saline is 1.5 hours at room temperature. The vials should be opened in a biological safety cabinet. VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, according to the Operations Manual. For patients less than 50 Kg of weight, a dose of 3×10¹² or 1×10¹³ VPs will be reduced by 30%. VB-111 should be administered at 1 ml/minute or 3 ml/minute (1×10¹³ VPs only). A regular meal will be allowed 0.5 hour after dosing. As previously planned, the first three subjects who received a repeat dose of 1×10¹³ VPs (following a previous dose of 3×10¹² VPs from cohort 3 or an initial dose of 1×10¹³ VPs in cohort 4) were monitored in an in-patient setting for an 8 hour period after their infusions. No infusion rate-related adverse events were reported.

Up to 6 Hours Following Drug Administration, Day 0: Laboratory Analyses:

Biodistribution: Blood sample will be collected for VB-111 adenovirus DNA level expression determinations at the following time points:

-   -   0 (Prior to dosing, see above)     -   At end of infusion     -   3±0.5 hours     -   6±0.5 hours

Cohorts 1-2 only: Urine samples will be collected for VB-111 adenovirus DNA levels determinations:

-   -   0 (prior to dosing, see above)     -   Between 0-3 hours     -   Between 3-6 hours

Angiogenic Biomarker/Cytokine Samples: Blood samples will be collected at 6 hours post dose for:

-   -   Levels of von Willebrand factor (vWF) and TNFα (optional).     -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF, FGF,         IL-6, IL-8, E-selectin, ICAM-1

Vital Signs: The vital signs (systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded at 30 and 60 minutes after dosing and at 4 and 6 hours post dosing, and/or upon disappearance of any adverse event, whichever comes first.

Adverse Events: Full supportive measures will be employed for all patients with an adverse event. All adverse events occurring following drug administration will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: There is no restriction on concomitant medication, besides the drugs listed in the exclusion criteria. However, VB-111 should not be mixed with other drugs. All concomitant medication administered during the study will be documented from baseline throughout participation or Early Termination visit.

Other Laboratory Analyses: Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations. In the event of clinically relevant abnormal laboratory values, the tests will be followed-up until the values have returned to within normal range and/or an adequate explanation of the abnormality is found. All such laboratory investigations will be performed at the study site, except for distribution assessments, which will be sent to an Independent Central Laboratory. Should any of these results require confirmation, re-testing will be performed in the same hospital laboratory where possible. Laboratory accreditation certificates and normal reference ranges must be provided for each hospital laboratory.

Follow Up for Cohorts 1 & 2

On Days 4±1, 7±1, 14±2, 28±3, 56±3, 84±3, 112±3, 140±3, 168±7/Early termination, each patient will be required to return to the clinic in a fasting state, for the following evaluations.

Vital signs: Vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

Laboratory Analyses: Blood sample will be collected for the following evaluations:

-   -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Hematology: hemoglobin, complete blood count, INR, PT, and         activated PTT     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin

Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations.

Urine samples will be collected for:

-   -   Routine urinalysis     -   VB-111 adenovirus DNA levels determinations

ECG: ECG will be performed on Day 28 and Day 168/early withdrawal visit (if prior to Day 28).

Tumor Measurement: Post study surveillance will include MRI scans every 2 months until 1 year post dosing, and then every 3 months until 2 years post dosing, or until progression. Additionally, Vital signs will be recording at these time points.

Post discontinuation follow-up period: Patients who progress and/or discontinue the study will be followed up by a telephone contact every 2 months for survival.

Follow Up for Cohorts 3 and 4: Day 4 Following D0 Dose, Days 56 and 112 (i.e. Days 4, 60 and 116)

As of the date of approval of this amendment (Amendment 11), the Day 4 visit is no longer required for any subjects in this trial. Prior to the approval of this amendment, the following clinic visit was performed (italics):

On the 4th day following dose at D0, D56 and D112, each patient will be required to return to the clinic in a fasting state for the following evaluations:

Vital signs: Vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

Laboratory Analyses: Blood samples will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT: In the case of PTT prolongation above         ULN, please refer to Section 6.2 Dose Delay/Modification for         further instructions.     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Angiogenic Biomarker/Cytokine samples:         -   Levels of von Willebrand factor (vWF) and TNFα (optional).         -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF,             FGF, IL-6, IL-8, E-selectin, ICAM-1

Urine will be collected for the following evaluations:

-   -   Routine urinalysis

Adverse Events: At the follow up visit, the patient will be questioned about possible adverse events which may have occurred from the day of last visit. All adverse events will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: At the follow up visit to the investigator, the patient will be questioned about possible medications which may have been taken from the day of last visit. All concomitant medications will be recorded with generic name, indication, dosage, units, frequency, start and stop dates.

Following the analysis of the first 6 subjects participating in Cohort 3 and the first 6 subjects participating in Cohort 4, it will be determined if this visit (Day 4 following Days 56 and 112), can be eliminated for each Cohort.

A Safety follow up telephone contact should be performed 14 days following the second dose (Day 56) visit for the first 3-6 subjects in each Cohorts 3 and 4 to ensure no DLTs have occurred.

Follow Up for Cohorts 3 and 4: Safety Telephone Contact Every Other Month in Between Dosing Visits

As of the date of approval of this amendment (Version 7.0), the Days 28 and 84 visits to the clinic are no longer required for any subjects in this trial. A telephone call should be made every other month in between dosing visits (days 28, 84, 140, etc.) to the subject to inquire about AEs and changes in medication.

Prior to the approval of this amendment, the following clinic visit was performed:

One month following the first two infusions (i.e. at D28 and Day 84), each patient will be required to return to the clinic in a fasting state, for the following evaluations:

Vital signs: Vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

Laboratory Analyses: Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count, INR, PT, and         activated PTT: In the case of PTT prolongation above ULN, please         refer to Section 6.2 Dose Delay/Modification for further         instructions.     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin     -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Angiogenic Biomarker/Cytokine samples:         -   Levels of von Willebrand factor (vWF) and TNFα (optional).         -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF,             FGF, IL-6, IL-8, E-selectin, ICAM-1

Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations.

Urine sample will be collected for: Routine urinalysis

Tumor Measurement: Subjects will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria.

Adverse Events: At the follow up visit to the investigator, the patient will be questioned about possible adverse events which may have occurred from the day of last visit. Full supportive measures will be employed for all patients with an adverse event. All adverse events will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: At the follow up visit to the investigator, the patient will be questioned about possible medications which may have been taken from the day of last visit. All concomitant medications will be recorded with generic name, indication, dosage, units, frequency, start and stop dates.

Further VB-111 Administration Cohorts 3 and 4 (Every 2 Months Following Initial Dose: Day 56, Day 112, Day 168, Month 8, Etc.)

On the day of admission to the site, each subject will be re-verified for eligibility according to inclusion/exclusion criteria (where applicable) and then tested within 24 hours prior to dosing. Subjects without evidence of progressive disease will be considered for further dosing.

This visit and VB-111 dosing will be repeated every 2 months until disease progression.

The following assessments will be performed:

Tumor Measure: Subjects will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria. MRI imaging will be done up to 72 hours prior to dosing to assess extent of cancer.

Physical Exam: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; and Neurologic.

ECG (Day 56 Only): A standard 12-lead electrocardiogram with rhythm strip should be performed.

Laboratory Analyses (according to the operation manual): Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT: In the case of PTT prolongation above         ULN, please refer to Section 6.2 Dose Delay/Modification for         further instructions.     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Angiogenic Biomarker/Cytokine samples will be collected prior to         dosing and 6 hours post dosing only when the patient is observed         for a minimum of 6 hours post dose (at the Investigator's         discretion):         -   Levels of von Willebrand factor (vWF) and TNFα (optional).         -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF,             FGF, IL-6, IL-8, E-selectin, ICAM-1     -   Serum pregnancy test

Urine will be collected for the following evaluation: Routine urine analysis

Vital Signs: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

Anti-Pyretic Treatment: To avoid fever following study drug administration, all patients will receive 1000 mg of acetaminophen 1-2 hours prior to dosing followed by 500 mg every 4 hours for 24 hours.

Corticosteroid Treatment: To reduce potential edema response during drug administration, dexamethasone treatment will be administered: Subsequent doses with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion. If subjects begin the study already on steroids, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

Study Drug Administration: Infusion will be done according to the operation manual. Prior to infusion, the saline should be brought to room temperature. The vials should be opened in a biological safety cabinet and injected into normal saline for infusion according to the operation manual. The final solution for administration should be administrated not more than 90 minutes after preparation. VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, as detailed in the Operations Manual. For patients less than 50 Kg of weight, a dose of 3×10¹² or 1×10¹³ VPs will be reduced by 30%. The intravenous infusions of diluted VB-111 should be administered at 1 ml/minute or 3 mL/minute (1×10¹³ VPs only). A regular meal will be allowed 0.5 hour after dosing.

Adverse Events: Full supportive measures will be employed for all patients with an adverse event. All adverse events occurring following drug administration will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: There is no restriction on concomitant medication, besides the drugs listed in the exclusion criteria. However, VB-111 should not be mixed with other drugs. All concomitant medication administered during the study will be documented from baseline until the Day 168 or Early Termination visit.

Other Laboratory Analyses: Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations. In the event of clinically relevant abnormal laboratory values, the tests will be followed-up until the values have returned to within normal range and/or an adequate explanation of the abnormality is found. All such laboratory investigations will be performed at the study site, except for distribution assessments, which will be sent to an Independent Central Laboratory. Should any of these results require confirmation, re-testing will be performed in the same hospital laboratory where possible. Laboratory accreditation certificates and normal reference ranges must be provided for each hospital laboratory.

Up to 6 Hours Following Further Drug Administration:

As of the date of approval of this amendment (Amendment 11), the 6 hour observation period is no longer required for any subjects in this trial.

Prior to the approval of this amendment, the following visit schedule was followed (italics):

Laboratory Analyses: Biodistribution: Blood sample will be collected for VB-111 adenovirus DNA level expression determinations at the following time points:

-   -   0 (Prior to dosing, see above)     -   At end of infusion     -   3±0.5 hours     -   6±0.5 hours

Angiogenic Biomarker/Cytokine Samples: Blood samples will be collected at 6 hours post dose for:

-   -   Levels of von Willebrand factor (vWF) and TNFα (optional).     -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF, FGF,         IL-6, IL-8, E-selectin, ICAM-1

Vital Signs: The vital signs (systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded at 30 and 60 minutes after dosing and at 4 and 6 hours post dosing, and/or upon disappearance of any adverse event, whichever comes first.

Adverse Events: Full supportive measures will be employed for all patients with an adverse event. All adverse events occurring following drug administration will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: There is no restriction on concomitant medication, besides the drugs listed in the exclusion criteria. However, VB-111 should not be mixed with other drugs. All concomitant medication administered during the study will be documented from baseline until the Day 168 or Early Termination visit.

Other Laboratory Analyses: Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations. In the event of clinically relevant abnormal laboratory values, the tests will be followed-up until the values have returned to within normal range and/or an adequate explanation of the abnormality is found. All such laboratory investigations will be performed at the study site, except for distribution assessments, which will be sent to an Independent Central Laboratory. Should any of these results require confirmation, re-testing will be performed in the same hospital laboratory where possible. Laboratory accreditation certificates and normal reference ranges must be provided for each hospital laboratory.

Upon Disease Progression: Cohort 3-4 Extension VB-111+Bevacizumab Administration Cohorts 3 and 4 (Every 2 Months Following Disease Progression)

At the time the subject experiences disease progression (any remaining stable subjects from cohort 3 and all subjects from cohort 4), the subject will be asked to participate in an extension phase of this trial, which will administer VB-111 and bevacizumab as a combination therapy. VB-111 (3×10¹² or 1×10¹³ VPs-see Dose Limiting Toxicities above) will be administered bi-monthly and bevacizumab will be administered bi-weekly.

Subjects will be informed of the advantages, risks and constraints of the study and will be asked to sign an informed consent form. Then subjects will be evaluated to ensure they meet the study criteria. Refer to Section 3.0 for Inclusion and Exclusion criteria, including bevacizumab specific exclusion criteria.

Since a minimum of 2 months is required between doses of VB-111, if a subject progresses before 2 months, the subject will begin treatment with bevacizumab (10 mg/kg) every 2 weeks and at 2 months from the last dose of VB-111, the subject will receive the first combination dose.]

The following assessments will be performed:

Tumor Measure; Subjects will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria. MRI imaging will be done up to 72 hours prior to dosing to assess extent of cancer.

Physical Exam: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; and Neurologic.

ECG (to be performed every 6 months from the initial combination dose.

A standard 12-lead electrocardiogram with rhythm strip should be performed.

Laboratory Analyses (according to the operation manual): Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT: In the case of PTT prolongation above         ULN, please refer to Section 6.2 Dose Delay/Modification for         further instructions.     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Antibody, biodistribution (VB-111 adenovirus DNA levels) and         transgene expression determination.     -   Angiogenic Biomarker/Cytokine samples are collected prior to         dosing and 6 hours post dosing only when the patient is observed         for a minimum of 6 hours post dose (at the Investigator's         discretion):         -   Levels of von Willebrand factor (vWF) and TNFα (optional).         -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF,             FGF, IL-6, IL-8, E-selectin, ICAM-1     -   Serum pregnancy test

Urine will be collected for the following evaluation:

-   -   Routine urine analysis     -   Dipstick for proteinuria

Vital Signs: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

Anti-Pyretic Treatment: To avoid fever following study drug administration, all patients will receive 1000 mg of acetaminophen 1-2 hours prior to dosing followed by 500 mg every 4 hours for 24 hours.

Corticosteroid Treatment: To reduce potential edema response during drug administration, dexamethasone treatment will be administered: Subsequent doses with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion. If subjects begin the study already on steroids, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

Bevacizumab Administration:

Bevacizumab will be administered by infusion at a dose of 10 mg/kg before VB-111 on dosing days. The rate of infusion shall be according to the package insert for bevacizumab: The initial bevacizumab dose should be delivered over 90 minutes as an IV infusion following chemotherapy. If the first infusion is tolerated, the second infusion may be administered over 60 minutes. If the 60-minute infusion is tolerated, all subsequent infusions may be administered over 30 minutes.

Study Drug Administration:

Infusion will be done according to the operation manual. Prior to infusion, the saline should be brought to room temperature. The vials should be opened in a biological safety cabinet and injected into normal saline for infusion according to the operation manual. The final solution for administration should be administrated not more than 90 minutes after preparation. VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, as detailed in the Operations Manual. For patients less than 50 Kg of weight, a dose of 3×10¹² or 1×10¹³ VPs will be reduced by 30%. The intravenous infusions of diluted VB-111 should be administered at 1 ml/minute or 3 mL/minute (1×10¹³ VPs only).

Up to 8 Hours Following the Initial Combination of VB-111 and Bevacizumab:

Laboratory Analyses: Biodistribution: Blood sample will be collected for VB-111 adenovirus DNA level expression determinations at the following time points:

-   -   0 (Prior to dosing, see above)     -   At end of infusion     -   3±0.5 hours     -   6±0.5 hours

Angiogenic Biomarker/Cytokine Samples: Blood samples will be collected at 6 hours post dose for:

-   -   Levels of von Willebrand factor (vWF) and TNFα (optional).     -   In addition, blood samples for TNF, sTNFRI, sTNFRII, VEGF, FGF,         IL-6, IL-8, E-selectin, ICAM-1

Vital Signs: The vital signs (systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded at 30 and 60 minutes after dosing and at 4 and 6 hours post dosing, and/or upon disappearance of any adverse event, whichever comes first.

Adverse Events: Full supportive measures will be employed for all patients with an adverse event. All adverse events occurring following drug administration will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: There is no restriction on concomitant medication, besides the drugs listed in the exclusion criteria. However, VB-111 should not be mixed with other drugs. All concomitant medication administered during the study will be documented from baseline throughout participation or Early Termination visit.

Other Laboratory Analyses: Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations. In the event of clinically relevant abnormal laboratory values, the tests will be followed-up until the values have returned to within normal range and/or an adequate explanation of the abnormality is found. All such laboratory investigations will be performed at the study site, except for distribution assessments, which will be sent to an Independent Central Laboratory. Should any of these results require confirmation, re-testing will be performed in the same hospital laboratory where possible. Laboratory accreditation certificates and normal reference ranges must be provided for each hospital laboratory.

Follow Up Cohort 3-4 Extension Phase:

Bi-Weekly Treatment with Bevacizumab

Bevacizumab will be administered according to standard of care practices bi-weekly. During the visits to the clinic to receive this treatment, the subject should be seen by the Investigator to assess safety.

Bevacizumab Administration

Bevacizumab will be administered by infusion at a dose of 10 mg/kg according to standard of care practices.

Adverse Events: Full supportive measures will be employed for all patients with an adverse event. All adverse events occurring following drug administration will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: There is no restriction on concomitant medication, besides the drugs listed in the exclusion criteria. However, VB-111 should not be mixed with other drugs. All concomitant medication administered during the study will be documented from baseline throughout participation or Early Termination visit.

Other Laboratory Analyses: Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations. In the event of clinically relevant abnormal laboratory values, the tests will be followed-up until the values have returned to within normal range and/or an adequate explanation of the abnormality is found. All such laboratory investigations will be performed at the study site, except for distribution assessments, which will be sent to an Independent Central Laboratory. Should any of these results require confirmation, re-testing will be performed in the same hospital laboratory where possible. Laboratory accreditation certificates and normal reference ranges must be provided for each hospital laboratory.

28 Days Following Initial Combination Treatment

One month following the initial combination treatment, each patient will be required to return to the clinic in a fasting state, for the following evaluations:

Vital signs: Vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

Laboratory Analyses: Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count, INR, PT, and         activated PTT: In the case of PTT prolongation above ULN, please         refer to Section 6.2 Dose Delay/Modification for further         instructions.     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin     -   Laboratory samples drawn in response to a clinically significant         event will be documented as unscheduled laboratory evaluations.     -   Urine sample will be collected for:     -   Routine urinalysis     -   Dipstick for Proteinuria     -   No dose modifications for grade 1/2 events     -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick         4+): Hold bevacizumab treatment until ≦Grade 2, as determined by         either UPC ratio ≦3.5 or 24 hr collection ≦3.5 g     -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab

Adverse Events: At the follow up visit to the investigator, the patient will be questioned about possible adverse events which may have occurred from the day of last visit. Full supportive measures will be employed for all patients with an adverse event. All adverse events will be documented in the case report forms (CRFs), together with the intensity, the therapeutic measures applied, the outcome and the relationship to the investigational drug. Related adverse events will be followed through resolution. Unrelated adverse events will be followed through resolution or end of study.

Concomitant Medications: At the follow up visit to the investigator, the patient will be questioned about possible medications which may have been taken from the day of last visit. All concomitant medications will be recorded with generic name, indication, dosage, units, frequency, start and stop dates.

Study Completion/Early Termination

Subjects in Cohorts 3 and 4 will continue to receive VB-111 every 2 months, provided that they continue to be stable. Once subjects experience disease progression, they may receive combination treatment with VB-111 or they will return to the clinic for a final study visit. In addition, if subjects withdraw consent or it is determined by the Investigator that the subject should not continue in the study, the subject will return for an Early Termination Visit. Subjects will continue to be followed every 2-3 months as part of their Standard of Care follow up. VBL may request data on these subjects (e.g. MRI scans, other anti-cancer treatments).

Subjects who are no longer seen for standard of care visits at the site should be contacted by telephone every 2-3 months to follow up on survival and for information regarding further treatment for glioblastoma. Follow up will continue until the patient expires.

Duration of Study

Cohorts 1-2: Each patient will be administered with a single injection of VB-111 and will be followed with regularly scheduled visits and evaluations for a period of 6 months after dosing or until progression or study withdrawal and then followed for survival by a post study follow-up telephone contact every 2 months. Additionally, surveillance MRIs will be performed every 2 months until 1 year post dosing, and then every 3 months until 2 years post dosing, Patients can decide to withdraw from study at any time. Patients who withdraw prior to day 168±7 should be requested to return to the clinic for an early termination visit and should still be contacted and questioned about AEs. (Patients who withdraw after day 168 will not be considered early terminations.) All AEs, irrespective of whether related or not to the disease, will be documented in the patient's record and CRF.

Cohorts 3 and 4: Subjects will be screened 3 weeks before the initial dose (D0) and will receive VB-111 every 2 months through disease progression. Following disease progression, routine Standard of Care will be performed; patients will be followed for disease status updates and survival every 2-3 months.

Exploratory Assessments

Optional Biopsy Samples; Biopsies of brain tissue (preferably fresh frozen samples) may be collected for further testing by VBL as part of a clinically indicated procedure at any time in the study. If a sample of brain tissue is collected, a blood sample for transgene analysis should be collected on the same day.

Circulating Endothelial Cells (CECs); Optionally, CECs may be collected and analyzed as a biomarker for angiogenesis via Flow Cytometry at any time in the study, if the subject consents and the site has local capability to perform such testing.

Additional Exploratory Testing: Samples collected for plasma, serum, tissue throughout the study will be stored by VBL or its designee for up to 15 years for exploratory testing to better understand the impact, potential response and toxicity of VB-111.

Expected Adverse Events/Dose Modifications Expected Adverse Events Pre-Clinical Studies

VB-111 caused minimal toxicity in preclinical toxicology studies in mice. Mild anemia, mild thrombocytopenia, mild leukocytosis, splenomegaly, and bone marrow hyperplasia were observed. Transient liver enzyme elevations with no correlation with clinical pathology were also observed.

Adenovirus Vectors and Anti-Angiogenic Agents

The administration of adenovirus vectors systemically has been well tolerated. Flu-like symptoms (fever, fatigue, rigors, nausea, and/or vomiting) are the most common adverse events. The majority of intravenously injected adenovirus particles are sequestered by the liver, which in turn causes an inflammatory response characterized by acute transaminitis and vascular damage.

The administration of anti-angiogenic agents systemically has also been well tolerated. The major predicted adverse effects have been wound healing disorders, bleeding and thromboembolic events. Hypertension and proteinuria have also been reported with antiangiogenic therapy.

Expected Adverse Events with Bevacizumab

Gastrointestinal (GI) perforation

Serious and sometimes fatal GI perforation occurs at a higher incidence in bevacizumab-treated patients compared to controls

The incidences of GI perforation ranged from 0.3% to 2.4% across clinical studies

Discontinue bevacizumab in patients with GI perforation

Surgery and Wound Healing Complications

The incidence of wound healing and surgical complications, including serious and fatal complications, is increased in bevacizumab-treated patients

Do not initiate bevacizumab for at least 28 days after surgery and until the surgical wound is fully healed. The appropriate interval between termination of bevacizumab and subsequent elective surgery required to reduce the risks of impaired wound healing/wound dehiscence has not been determined

Discontinue bevacizumab at least 28 days prior to elective surgery and in patients with wound healing complications requiring medical intervention

Hemorrhage

Severe or fatal hemorrhage, including hemoptysis, GI bleeding, hematemesis, central nervous system hemorrhage, epistaxis, and vaginal bleeding, occurred up to 5-fold more frequently in patients receiving bevacizumab. Across indications, the incidence of grade ≧3 hemorrhagic events among patients receiving bevacizumab ranged from 1.2% to 4.6%

Do not administer bevacizumab to patients with serious hemorrhage or recent hemoptysis (≧½ tsp of red blood)

Discontinue bevacizumab in patients with serious hemorrhage (ie, requiring medical intervention)

Additional Serious Adverse Events

Additional serious and sometimes fatal adverse events with increased incidence in the bevacizumab-treated arm vs control included

Non-GI fistula formation (≦0.3%)

Arterial thromboembolic events (grade ≧3, 2.6%)

Proteinuria (nephrotic syndrome, <1%)

Additional serious adverse events with increased incidence in the bevacizumab-treated arm vs control included

Hypertension (grade 3-4, 5%-18%)

Reversible posterior leukoencephalopathy syndrome (RPLS) (<0.1%)

Infusion reactions with the first dose of bevacizumab were uncommon (<3%), and severe reactions occurred in 0.2% of patients

Inform females of reproductive potential of the risk of ovarian failure prior to starting treatment with bevacizumab

Most common adverse reactions observed in bevacizumab patients at a rate >10% and at least twice the control arm rate were epistaxis, headache, hypertension, rhinitis, proteinuria, taste alteration, dry skin and rectal hemorrhage.

Dosing Delays/Dose Modification

For subjects participating in multiple dose cohorts, dosing may be delayed in the following situations:

-   -   Subjects who experienced a VB-111 drug related adverse event,         and are scheduled for a repeat dose, the repeat dose will be         delayed until the severity of the event is no more than CTCAE         Grade 1.     -   Subjects who experienced a prolongation of aPTT and are         scheduled for a repeat dose, the repeat dose will be delayed         until the PTT has returned to within 20% of the baseline value,         whether any positive LAC or APLA test has normalized or not.         Borderline cases may be discussed with the sponsor on a case by         case basis. Subjects with clinically significant thrombotic or         bleeding events related to a prolonged PTT should not receive         additional doses of VB-111.         -   In case of PTT prolongation above ULN, blood should be drawn             for lupus anticoagulant (LAC) and for anti-phospholipid             antibody (IgG and IgM for beta-2-GP-1 and anticardiolipin).             Patients with prolonged aPTT should not receive VB-111 until             the abnormal laboratory values return to within 20% of the             baseline value, whether any positive LAC or APLA test has             normalized or not. If repeat test for LAC/APLA remains             positive, it must be repeated every 12 weeks (from the             initial positive test) until it returns to normal.         -   During DLT monitoring. To comply with protocol restrictions             regarding 14 day observation periods between patients

Patients will be assigned to Cohort 3 (single or multiple doses of 3×10¹² VPs) or Cohort 4 (multiple doses of 1×10¹³ VPs). No dose modification will be permitted for this trial. However, VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, as detailed in the Operations Manual. For patients less than 50 Kg of weight, a dose of 3×10¹² or 1×10¹³ VPs will be reduced by 30%. The intravenous infusions of diluted VB-111 should be administered at 1 ml/minute or 3 mL/minute (1×10¹³ VPs only).

Correlative/Special Studies

Distribution: For distribution assessment, blood samples will be collected from all patients according to the operation manual. Testing of these samples for Adenovirus and VB-111 transgene level determination will be conducted at the maximal tolerated dose group or the highest dose cohort. Distribution will be assessed by determination of levels of viral DNA and transgene by Q-PCR and Q-RT-PCR respectively in the blood, at pre-determined time points following dosing. Samples will be collected for all patients at all pre-defined time points. Samples found with non-detectable levels of viral DNA following dosing will not be tested for levels of the transgene and will not be evaluated for later time points.

Antibodies: Serum samples will be collected for analysis of levels of antibodies to the adenovirus according to the Operation Manual.

Procedures for Handling Blood Samples: Refer to the Operation Manual for instructions for a full description on Procedures for Safety Samples and Procedures for Q-PCR and Q-RT-PCR Determination.

Measurement of Effect

Tumor response will be assessed, using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria, until progression of disease (local and central independent radiology review). For patients who do not progress or die, PFS will be censored at the time of initiation of alternative anticancer therapy, date of last radiologic assessment, or time of last contact.

DEFINITIONS

Response and progression will be evaluated in this study using the new international criteria proposed by the Response Assessment in Neuro-Oncology (RANO) Working Group [JCO, Updated Response Assessment Criteria for High-Grade Gliomas: Response Assessment in Neuro-Oncology (RANO) Working Group, in press] Note: Lesions are either measurable or non-measurable using the criteria provided below. The term “evaluable” in reference to measurability will not be used because it does not provide additional meaning or accuracy.

Measurable Disease: Measurable disease is defined as bidimensionally contrast-enhancing lesions with clearly-defined margins by MRI, with two perpendicular diameters of at least 10 mm, visible on 2 or more axial slices which are preferably at most 5 mm apart with 0 mm skip. In the event the MRI is performed with thicker slices, the size of a measurable lesion at baseline should be two times the slice thickness. In the event there are inter-slice gaps, this also needs to be considered in determining the size of measurable lesions at baseline.

Measurement of tumor around a cyst or surgical cavity is problematic. In general, such lesions should be considered non-measurable unless there is a nodular component measuring at least 10 mm in diameter. The cystic or surgical cavity should not be measured in determining response.

All tumor measurements must be recorded in millimeters (or decimal fractions of centimeters).

Non-measurable Disease: This is defined as either unidimensionally measurable lesions, masses with margins not clearly defined, or lesions with maximal perpendicular diameters <10 mm.

Target Lesions: All measurable lesions up to a maximum of five lesions should be identified as target lesions and recorded and measured (sum of the products of the perpendicular diameters) at baseline. Target lesions should be selected on the basis of their size (lesions with the longest diameters) and their suitability for accurate repeated measurements by imaging techniques. Occasionally, the largest lesions may not be suitable for reproducible measurements and the next largest lesions which can be measured reproducibly should be selected.

Non-target Lesions: For patients with recurrent disease who have multiple lesions of which only one or two are increasing in size, the enlarging lesions should be considered the target lesions for evaluation of response. The other lesions will be considered non-target lesions and should also be recorded.

Rarely, unequivocal progression of a non-target lesion requiring discontinuation of therapy, or development of a new contrast-enhancing lesion may occur even in the setting of stable disease (SD) or partial response (PR) in the target lesions. These changes would qualify as progression.

Non-target lesions also include measurable lesions that exceed the maximum number of 5. Measurements of these lesions are not required but the presence or absence of each should be noted throughout follow-up.

Guidelines for Evaluation of Measurable Disease

All measurements should be taken and recorded in metric notation using a ruler or calipers. All baseline evaluations should be performed within 72 hours before the beginning of the treatment.

Conventional MRI is required, CT is not acceptable. The same method of assessment and the same technique should be used to characterize each identified and reported lesion at baseline and during follow-up.

These techniques should be performed with cuts of 10 mm or less in slice thickness contiguously. The MRIs will be evaluated both locally and centrally by a core lab.

Response Criteria

Evaluation of Target Lesions: Complete Response (CR): Requires all of the following:

-   -   Complete disappearance of all enhancing measurable and         non-measurable disease sustained for at least 4 weeks     -   No new lesions     -   Stable or improved non-enhancing (T2/FLAIR) lesions     -   Patients must be off corticosteroids     -   Stable or improved clinically

Partial Response (PR): Requires all of the following:

-   -   ≧50% decrease compared to baseline in the sum of products of         perpendicular diameters of all measurable enhancing lesions         sustained for at least 4 weeks     -   No progression of non-measurable disease     -   No new lesions     -   Stable or improved non-enhancing (T2/FLAIR) lesions on same or         lower dose of corticosteroids compared to baseline scan     -   The corticosteroid dose at the time of the scan evaluation         should be no greater than the dose at time of the baseline scan     -   Stable or improved clinically

Stable Disease (SD): Requires all of the following:

-   -   Does not qualify for complete response, partial response, or         progression     -   Stable non-enhancing (T2/FLAIR) lesions on same or lower dose of         corticosteroids compared to baseline scan. In the event that the         corticosteroid dose has been increased, the last scan considered         to show stable disease will be the scan obtained when the         corticosteroid dose was equivalent to the baseline dose     -   Stable clinically

Progression: Defined by any of the following:

-   -   ≧25% increase in the sum of products of perpendicular diameters         of enhancing lesions compared to the smallest tumor measurement         obtained either at baseline (if no decrease) or best response,         on stable or increasing doses of corticosteroids     -   Significant increase in T2/FLAIR non-enhancing lesion on stable         or increasing doses of corticosteroids compared to baseline scan         or best response following initiation of therapy, not due to         co-morbid events (e.g. radiation therapy, demyelination,         ischemic injury, infection, seizures, post-operative changes, or         other treatment effects).     -   Any new lesion     -   Clear clinical deterioration not attributable to other causes         apart from the tumor (e.g. seizures, medication side effects,         complications of therapy, cerebrovascular events, infection,         etc.) or changes in corticosteroid dose     -   Failure to return for evaluation due to death or deteriorating         condition     -   Clear progression of non-measurable disease

If there is uncertainty regarding whether there is progression, the patient may continue on treatment and remain under close observation. If subsequent evaluations suggest that the patient is progressing, the date of progression should be the time point at which this issue was initially raised.

These RANO Response Criteria are also summarized in the following table:

TABLE 6 Summary of the RANO Response Criteria CR PR SD PD# T1-Gd + None ≧50% <50% ≧25% decrease decrease- increase* <25% increase T2/FLAIR Stable or Stable or Stable or Increase* decrease decrease decrease New Lesion None None None Present* Corticosteroids None Stable or Stable or NA decrease decrease Clinical Stable or Stable or Stable or Decrease* Status increase increase increase Requirement All All All Any* for Response CR = complete response; PR = partial response; SD = stable disease; PD = progressive disease #Progression occurs when any of the criteria with * is present NA: Increase in corticosteroids alone will not be taken into account in determining progression in the absence of persistent clinical deterioration

Confirmatory Measurement/Duration of Response Confirmation

To be assigned a status of PR or CR, changes in tumor measurements must be confirmed by repeat assessments that should be performed 4 weeks after the criteria for response are first met.

Duration of Overall Response

The duration of overall response is measured from the time measurement criteria are met for CR or PR (whichever is first recorded) until the first date that recurrent or progressive disease is objectively documented (taking as reference for progressive disease the smallest measurements recorded since the treatment started).

The duration of overall CR is measured from the time measurement criteria are first met for CR until the first date that recurrent disease is objectively documented.

Duration of Stable Disease

Stable disease is measured from the start of the treatment until the criteria for progression are met, taking as reference the smallest measurements recorded since the treatment started.

Statistical Considerations Study Design

Objectives: To evaluate the safety, tolerability, and efficacy of single and multiple doses of VB 111 (1×10¹², 3×10¹², 1×10¹³ viral particles [VPs]) in patients with recurrent GBM; to evaluate the distribution of VB-111 after single and multiple IV infusions and the level of antibodies to the adenovirus vector and transgene

Up to 90 subjects are anticipated to enroll in this study, with up to 29 subjects at the 3×10¹² VP dose level, and up to 49 subjects at the 1×10¹³ VP dose level. Cohorts 1-2 will enroll up to 6 patients in each. Cohort 3 will be conducted according to the Simon's 2 step method.

Step one will include the first 10 evaluable patients at the 1×10¹³ VP dose level or MTD.

For efficacy analysis, evaluable patients will be defined as those who received at least one repeat dose of 1×10¹³ VPs or of MTD, or patients who progressed sooner than 2 months after an initial dose of 1×10¹³ VPs (from cohort 3 or 4).

A subject will be considered to have a response if s/he is either alive and progression free at 6 months or has at least a partial tumor response according to Rano criteria within 6 months post dosing. If less than 2 responses are observed in the step 1 subjects, step 2 will be halted, otherwise, an additional 19 subjects will enroll in step 2.

Cohort 4 will enroll up to 49 subjects.

It is anticipated that at least 29 patients enrolled in Cohorts 3 or 4 will be evaluable after enrolling into Cohort 3-4 EXT. Based on historical information, it is anticipated that this sample will allow preliminary assessment of safety and efficacy of this regimen for the treatment of recurrent GBM.

The following study stopping rules for halting the study will be applied:

-   -   If 3 out of 6 subjects in the Cohorts 1 & 2 experience drug         related DLT (or 5 out of 9 or 6 out of 12);     -   If 2 of the subjects in Cohort 1 experience a DLT;     -   If ANY death occurs within two weeks after the product is given,         except death due to disease progression or clearly unrelated to         study drug. Enrollment will be temporarily suspended for an ad         hoc, emergency IDMC meeting to review the case and make a         recommendation if enrolment can be reinstated.

Safety and Tolerability Endpoints

To evaluate the safety and tolerability of single and multiple doses of VB-111 (1×10¹², 3×10¹², 1×10¹³ VPs) the following safety endpoints will be assessed throughout the study:

-   -   Adverse events will be recorded on an ongoing basis for the         whole duration of the study. Adverse events will be assessed for         seriousness, relatedness to study drug, and severity (According         to CTCAE 4.0).     -   Vital signs will be recorded at screening, prior to each dosing,         30 and 60 minutes, 4 and 6 hours after the first dosing and at         all follow up visits.     -   Physical examinations will be conducted in Cohorts 1-2 at         screening, baseline, Days 14, 28, 56, 84, 112, 140 and Day 168.         In Cohorts 3-4, a physical exam will be conducted at         screening/baseline, before each dosing, and the study         completion/early termination.     -   12-lead ECG will be obtained in Cohorts 1-2 at screening, prior         to dosing, Day 28 and Day 168 (or ET). In Cohorts 3-4, an ECG         will be obtained at screening/baseline, the Day 56 visit, and         the study completion/early termination visit.     -   Safety laboratory assessment (blood hematology, chemistry, and         urinalysis) will be conducted at screening, prior to dosing, and         at all patient visits.

Primary Efficacy Endpoint: To evaluate the efficacy of single or multiple doses of VB-111 (1×10¹², 3×10¹², 1×10¹³ VPs) in recurrent GBM subjects, 6 months progression free survival (PFS) will be assessed, defined as proportion of subjects who are progression free at 6 months from enrollment. In another aspect, overall survival will be assessed as the primary efficacy endpoint and 6-months PFS will be assessed as a secondary efficacy endpoint. Overall survival is defined as the time from enrollment until death from any cause. Patients will be followed for survival status after completion or removal from the study for progression or toxicity, and will be included in the PFS and OS analyses.

Secondary Efficacy Endpoints: To evaluate the efficacy of single or multiple doses of VB-111 (1×10¹², 3×10¹², 1×10¹³ VPs), or multiple doses of VB-111 together with bevacizumab in recurrent GBM subjects the following secondary efficacy endpoints will be assessed:

-   -   In one aspect, secondary efficacy endpoints will be assessed by         Overall survival (OS): Overall survival is defined as the time         from enrollment until death from any cause. Patients will be         followed for survival status after completion or removal from         the study for progression or toxicity, and will be included in         the PFS and OS analyses.     -   In another aspect, secondary efficacy endpoints will be assessed         by Progression Free Survival (PFS): Progression free survival is         defined as the time from enrollment until objective tumor         progression, assessed according to Response Assessment in         Neuro-Oncology (RANO) Working Group (see details in section         8.3.1).     -   Progression Free Survival at 6 months (PFS-6) is defined as the         proportion of subjects who are progression free at 6 months from         enrollment     -   Event free survival (EFS): Event-free survival is defined as         measurement from the date of enrollment until termination of         treatment due to toxicity, disease progression, relapse, or         death from any cause.     -   Tumor response: based on MRI, assessed according to Response         Assessment in Neuro-Oncology (RANO) Working Group (see details         in section 8.3.1)

Power and Sample Size Considerations

In one embodiment, the primary efficacy endpoint is Overall Survival. Using data presented in Friedman et al., “Bevacizumab alone and in combination with irinotecan in recurrent glioblastoma,” J. Clin Oncol. 27(28):4733-40 (2009), OS in the bevacizumub group at 12 months is 25%. Based on preliminary data, it is expected that the 12 month overall survival rate in the VB-111 group will be approximately 50% (hazard ratio=0.5). Assuming a proportional hazards model, a sample size of 45 patients in the VB-111 group generating approximately 23 events, a 0.05 level two-sided Logrank test will have 80% power to detect a difference of survival curves. The final analysis will compare Kaplan Meier survival curves of BEV (based on Friedman et al data) vs. VB-111 survival data using the Log-rank Test (Piantadosi 2005).

Alternatively, this study will assess efficacy endpoints using a two-stage Simon design. In this study response is defined by either 6 months PFS or at least a partial tumor response. With a minimum of 10 patients and a maximum of 29 patients the null hypothesis that the true proportion of PFS-6 is at most 10% vs the alternative hypothesis that the 6 month PFS is at least 30%:

H0: PFS-6<=10% H1: PFS-6>=30%

This has a significance level of 5% when the true proportion is 10% and 80% power when the true proportion is at least 30%.

Unless toxicity is encountered or the study is stopped at the interim analysis, this study anticipates accruing between 3-6 subjects in Cohort 1, 3-6 subjects in Cohort 2, up to 29 subjects in Cohort 3 and up to 49 subjects in Cohort 4.

It is anticipated that at least 29 patients enrolled in Cohorts 3 or 4 will be evaluable after enrolling into Cohort 3-4 EXT. Based on historical information, it is anticipated that this sample will allow preliminary assessment of safety and efficacy of this regimen for the treatment of recurrent GBM.

Statistical Methods

All data collected will be summarized and presented. Continuous variables will be described as the mean, median, standard deviation and range of n observations. Categorical data will be described with contingency tables including frequency and percent. Individual subject listings will be generated and presented.

Confidence intervals will be calculated at the (two-sided) 95% level of confidence (except for the primary efficacy and safety endpoints, which will be 99% and 95% (one-sided) respectively.

All patients meeting the eligibility criteria who have signed a consent form and have received VB-111 will be considered evaluable for safety analysis.

Statistical descriptions and analyses will be carried out using SAS statistical analysis software (SAS Institute, Inc., Cary, N.C., USA).

Demographic Parameters

Demographic parameters including sex, age, height and weight will be summarized overall and by treatment group.

Safety and Toxicity Analyses

Adverse events monitoring and clinical findings will be used to assess safety.

AEs will be categorized by SOC and Preferred Terms using the MedDRA dictionary. The incidence of AEs as well as the severity and relationship to study drug will be presented. As per NCI CTCAE Version 4.0, the term toxicity is defined as adverse events that are classified as either possibly, probably, or definitely related to study treatment. The maximum grade for each type of toxicity will be recorded for each patient and will be used for reporting. Frequency tables will be reviewed to determine toxicity patterns. In addition, all adverse event data graded as 3, 4, or 5 and classified as either “unrelated or unlikely to be related” to study treatment in the event of an actual relationship developing will be reviewed.

Serious adverse events will be similarly summarized.

Infusional adverse events will also be summarized by both the investigator's and the sponsor's assessment of causality.

The number and proportion of patients who have one or more AEs will be presented as well.

Clinical findings will include evaluation of physical examinations, vital signs and laboratory test results, concomitant medications, and withdrawals/terminations. These findings will be summarized by dose group. Continuous variables will be described as the mean, median, standard deviation, and range of n observations. Categorical data will be described with contingency tables including frequency and percent.

Efficacy Analyses

Overall survival (OS) is defined as the time from the first date of study treatment until the date of subject death from any cause. For subjects who have not died, survival data will be censored at the subject's last known alive date. The Kaplan-Meier method will be used to estimate the distribution and median OS for subjects treated at the MTD level.

Progression Free Survival (PFS) is defined as the time from the first date of study treatment to documented disease progression, or to death from any cause whichever occurs earlier. Tumor response and disease progression will be assessed by the investigator according to RANO criteria. The proportion of subjects who have 6 months PFS will be presented for each treatment group. For patients who do not progress or die, PFS will be censored at the time of initiation of alternative anticancer therapy, date of last tumor assessment, or time of last contact. The Kaplan-Meier method will be used to estimate the distribution and median PFS for subjects treated at the 3×10¹² and 1×10¹³ VPs levels, or multiple doses of VB-111 together with bevacizumab.

Event Free Survival is defined as measurement from the date of enrollment until termination of treatment due to toxicity, disease progression, relapse, or death from any cause. The Kaplan-Meier method will be used to estimate the distribution and median of event free survival for subjects treated at the MTD level.

Tumor Response is defined according the RANO Response criteria. See Section 8.3 for definitions of Complete Response, Partial Response, Stable Disease and Progression. Tumor response will be assessed at Screening, prior to dosing, Days 14, 28, 56, 84, 112, 140 (Cohorts 1-2 only) and 168 and every 2 months thereafter, using contrast and non-contrast brain magnetic resonance imaging (MRI). The frequency and percentage of tumor response will be presented by timepoint and treatment group. For Cohorts 3-4, and the extension, tumor response will be assessed at Screening, prior to dosing, Days 28, 56, 84, 112, and every 2 months thereafter. Following this protocol amendment (Version 7.0), scans will be performed every 2 months from initial dose.

Biodistribution

The Biodistribution of VB-111 in blood will be presented.

Number of Patients Planned to be Enrolled

Based on the study design it is estimated that a maximum of 90 eligible (3-6 in each of cohorts 1 and 2, up to 29 in cohort 3, and up to 49 in Cohort 4) with recurrent GBM cancer are needed, 29 evaluable patients are required for efficacy assessment.

Criteria for Termination of the Trial

The sponsor reserves the right to terminate the study early for administrative (e.g. center not complying with GCP) or safety reasons as described under 4.2.

Procedure for Accounting for Missing, Unused and Spurious Data

Missing data will be indicated in the listings, but excluded from all descriptive analyses. All data will be listed, including otherwise unused data. Spurious data will be identified as such, wherever possible.

Selection of Patients to be Included in the Analyses

The Full Analysis Set will consist of all patients enrolled who receive study medication. The biodistribution subset will consist of all patients for whom a VB-111 profile is obtained.

Interim Analyses:

An interim analysis will be performed after enrollment of 10 evaluable patients (as defined above) who have reached day 168 time point (6 months) or have discontinued prior to that, The results of the interim analysis will determine whether the remainder of the patients will be enrolled into cohort 4 in order to complete the study.

Example 3

Methods:

VB-111 was administered as a single intravenous infusion at escalating doses from 1×10¹² (cohort 1) to 3×10¹² (cohort 2) viral particles (VPs), followed by repeat doses of 3×10¹² or 1×10¹³ every 2 months (cohorts 3-4). Assessments included safety, pharmacokinetics, tumor response according to RANO criteria and overall survival.

Results:

Twenty eight patients aged 26-74 years at 3 medical centers in the US received up to 8 repeat doses of VB-111. The median overall survival was 360 [range: 70-574] and 266 days [range: 28-664] for patients receiving at least one dose of 1×10¹³ VPs (high dose) vs subjects who received lower doses, respectively (p NS). Progression free survival was 87 vs 55 days for patients who received high dose and for lower doses, respectively (p=0.01). Median follow-up was 232 days. Three patients had a partial response (PR) at 82, 86 and 408 days post initial VB-111 dosing. Twenty one of the patients who progressed after VB-111 treatment received bevacizumab off study; 7 of the 15 evaluable patients (47%) had a PR compared to a 30% expected PR rate according to literature. VB-111 was safe and well tolerated, 53 adverse events were reported, 14 were classified as possibly related to VB-111. All events were of CTCAE grade 1-2 except one grade 3 pulmonary embolism (PE). There were no study related deaths. One patient developed peri-tumoral edema post dosing, which resolved with corticosteroid therapy. Events occurring in more than 10% of the patients included headache and fatigue.

As this study continued, additional subjects with progressive disease were treated with bevacizumab and the study data were recalculated accordingly. Twenty three of the subjects who had progressive disease (PD) on VB-111 treatment received bevacizumab off study; 6 of the 15 evaluable subjects (40%) had a partial response (PR) compared to 30% expected according to literature. The data are provided in the Table below.

TABLE 7 Post-VB-111 Response to bevacizumab Exposure to Subject ID bevacizumab Best Response* 60-001 Yes PD 60-002 Yes PD 60-003 Yes SD 60-004 Yes SD 60-005 Yes PR 61-001 Yes Unknown 61-002 Yes Unknown 61-003 Yes SD 61-004 Yes Unknown 61-005 Yes Unknown 62-002 No N/A 62-003 Yes PR 62-004 Yes PR 62-005 Yes Unknown 62-006 Yes SD 62-007 Yes PD 62-008 Unknown Unknown 62-009 Yes Unknown 62-010 Subject still stable on VB-111 62-011 Yes PD 62-012 Yes Unknown 62-013 Yes PR 62-014 Unknown Unknown 62-015 Yes SD 62-016 Yes PR 62-017 Yes PR 62-018 Yes Unknown 62-019 Subject still stable on VB-111 *PD, progressive disease; PR, partial response; SD, stable disease

Additional patients were subsequently added to the study and the data were recalculated accordingly. Forty six patients aged 27-76 years at 4 medical centers in the US and Israel received up to 13 repeat doses of VB-111. Of these, 30 patients received the high dose (1×10¹³ VPs). There were 22 related adverse events, 19 CTCAE grade 1-2; grade 3 included pulmonary embolism, peri-tumoral edema and DVT. The median overall survival was 360 [range: 70-574] and 266 days [range: 28-664] for patients receiving at least one high dose vs. subjects who received lower doses, respectively (p NS). Progression free survival was 63 vs. 55 days for patients who received high vs. lower doses, respectively (p=0.01). Median follow-up was 232 days. Six patients had a partial response and/or prolonged disease stability (≧180 days). Tumor growth rates showed a statistically significant dose response. Eleven patients received combination therapy of up to 4 doses of VB-111 together with bevacizumab after progression on VB-111 monotherapy. Median time to second progression was 93 days. These data are shown in FIG. 2. FIG. 3 provides an example of a patient who was treated with a combination of VB-111 and bevacizumab upon disease progression. VB-111 was safe and well tolerated both as monotherapy and combined therapy.

Conclusions:

VB-111 was safe and well tolerated in patients with recurrent GBM with repeat doses of up to 1×10¹³ VPs. Tumor responses were seen. Overall survival was about 3 months longer compared to historical data in recurrent GBM including standard of care anti-angiogenic agents. Data suggests that VB-111 potentiates the response to bevacizumab given at further progression.

Example 4 Administration of Multiple Doses of Ad5-PPE-1-3X-Fas-c Combined with Bevacizumab

OBJECTIVE: To evaluate the safety, tolerability, and efficacy of multiple doses of VB-111 1×10¹³ viral particles (VP) in patients with recurrent GBM every 8 weeks as monotherapy, combined with bevacizumab 10 mg/Kg every 2 weeks upon progression compared to bevacizumab monotherapy in patients with recurrent GBM.

The patients in the intervention arm will first receive VB-111, followed by combination of VB-111 with bevacizumab upon progression.

In one embodiment, further efficacy of VB-111 can be observed in combination with bevacizumab even after progression on VB-111 monotherapy, since synergism may potentiate VB-111 activity and overcome drug resistance. Also, in some cases delayed response to VB-111 was observed in the patients several months after receiving VB-111. Thus, some patients may experience rapid disease progression upon study enrollment without the opportunity to respond to VB-111. The proposed regimen may provide benefit from such delayed responses.

Inclusion Criteria

First or second progression or first recurrence of Glioblastoma (according to updated RANO Criteria, see Table 8) following standard of care treatment with temozolomide and radiation;

A histologically confirmed diagnosis of GBM. Patients with surgically resectable disease at recurrence may be enrolled, even if there is no residual disease upon surgical resection. An interval of at least 4 weeks between prior surgical resection and study enrollment;

TABLE 8 Criteria for Response Assessment Incorporating MRI and Clinical Factors (From updated RANO criteria as published in Wen et al., “Updated response assessment criteria for high-grade gliomas: response assessment in neuro-oncology working group., J Clin Oncol 28: 1963-1972 (2010). Response Criteria Complete Requires all of the following: complete disappearance of all response enhancing measurable and non-measurable disease sustained for at least 4 weeks; no new lesions; stable or improved non- enhancing (T2/FLAIR) lesions; patients must be off corticosteroids (or on physiologic replacement doses only); and stable or improved clinically. Note: Patients with non- measurable disease only cannot have a complete response; the best response possible is stable disease. Partial Requires all of the following: ≧50% decrease compared with response baseline in the sum of products of perpendicular diameters of all measurable enhancing lesions sustained for at least 4 weeks; no progression of non-measurable disease; no new lesions; stable or improved non-enhancing (T2/FLAIR) lesions on same or lower dose of corticosteroids compared with baseline scan; the corticosteroid dose at the time of the scan evaluation should be no greater than the dose at time of baseline scan; and stable or improved clinically. Note: Patients with non-measurable disease only cannot have a partial response; the best response possible is stable disease. Stable Requires all of the following: does not qualify for complete disease response, partial response, or progression; stable non- enhancing (T2/FLAIR) lesions on same or lower dose of corticosteroids compared with baseline scan. In the event that the corticosteroid dose was increased for new symptoms and signs without confirmation of disease progression on neuroimaging, and subsequent follow-up imaging shows that this increase in corticosteroids was required because of disease progression, the last scan considered to show stable disease will be the scan obtained when the corticosteroid dose was equivalent to the baseline dose. Progres- Defined by any of the following: ≧25% increase in sum of sion the products of perpendicular diameters of enhancing lesions compared with the smallest tumor measurement obtained either at baseline (if no decrease) or best response, on stable or increasing doses of corticosteroids*; significant increase in T2/FLAIR non-enhancing lesion on stable or increasing doses of corticosteroids compared with baseline scan or best response after initiation of therapy* not caused by comorbid events (e.g., radiation therapy, demyelination, ischemic injury, infection, seizures, postoperative changes, or other treatment effects); any new lesion; clear clinical deterioration not attributable to other causes apart from the tumor (e.g., seizures, medication adverse effects, complications of therapy, cerebrovascular events, infection, and so on) or changes in corticosteroid dose; failure to return for evaluation as a result of death or deteriorating condition; or clear progression of non-measurable disease.

All measurable and non-measurable lesions must be assessed using the same techniques as at baseline. Abbreviations: MRI, magnetic resonance imaging; FLAIR, fluid-attenuated inversion recovery. * Stable doses of corticosteroids include patients not on corticosteroids

Exclusion Criteria

Pregnant or breastfeeding patients;

Evidence of CNS haemorrhage CTCAE grade 2 or above on baseline MRI;

Patients who suffered from an acute cardiac event within the last 12 months;

Patients with active vascular disease, either myocardial or peripheral (i.e. acute coronary syndrome, cerebral stroke, transient ischemic attack or arterial thrombosis or symptomatic peripheral vascular disease within the past 3 months);

Patients with known proliferative and/or vascular retinopathy;

Patients with known liver disease (alcoholic, drug/toxin induced, genetic, or autoimmune);

Patients that have undergone major surgery within the last 4 weeks before enrollment;

Minor surgical procedure, e.g. stereotactic biopsy, within 7 days of first study treatment; placement of a vascular access device, within 2 days of first study treatment;

History of intracranial abscess within 6 months prior to first study treatment;

History of active gastrointestinal bleeding within 6 months prior to first study treatment;

Serious, non-healing wound, active ulcer, or untreated bone fracture;

Treatment Plan

This study is a prospective, randomized, controlled, 2-arm, open label, multi-center, Phase 3 study, measuring the efficacy, safety, tolerability of multiple doses of intravenously administered VB-111 followed by VB-111 and bevacizumab as compared to bevacizumab monotherapy in patients with recurrent GBM.

Patients will be screened for eligibility and then, up to 28 days later, at the baseline visit, randomized to one of two treatment groups in a 1:1 ratio (investigative arm to control arm). Patients will be randomized and stratified according to age at randomization (≦60 years, <60 years), KPS (<80, ≧80) and progression (1st progression, 2nd progression). The intervention arm will receive monotherapy with VB-111 administered as multiple intravenous infusions of 1×10¹³ VPs every 8 weeks, which will, upon progression, be combined with bevacizumab 10 mg/kg every 2 weeks. This regimen will continue until further progression. The control arm will receive monotherapy with bevacizumab 10 mg/kg every 2 weeks until progression.

The patients will remain in the study until discontinuation due to disease progression or withdrawal. Thereafter, follow-up for survival will continue until the patient expires.

An overview of the study is shown in FIG. 1.

Study Visits Screening, Day −28-0 (all Patients)

Prospective patients will be screened within 4 weeks of enrollment. Patients will be informed of the advantages, risks and constraints of the study and will be asked to sign an informed consent form. Patients who have provided consent will be assigned an identification number which consists of the center number (e.g. 01) plus the subject/patient number in sequential order (e.g., 001, 002, 003, etc.). The full identification number for the first patient at center 01 will be 01-001, 01-002, etc.

Patients will proceed to screening assessments as shown in Example 2.

Baseline Visit Day 1 (all Patients)

Study treatment (VB-111 or bevacizumab) will be administered as an outpatient. Once the subject/patient is found eligible, he/she will be scheduled to arrive at the clinic within 4 weeks from screening in a fasting state until 30 minutes following study drug administration.

Prior to dosing (D1):

On the day of admission to the site, each subject/patient will be re-verified for eligibility according to inclusion/exclusion criteria and then tested within 24 hours prior to dosing for the following evaluations:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since signing the consent form.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since signing the consent form.

TUMOR MEASURE: Contrast and non-contrast brain MRI imaging will be done to assess extent of cancer. If there are less than 2 weeks between screening and baseline visits, only 1 MRI will be required.

LABORATORY ANALYSES:

Blood samples:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT;     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Antibody to the Ad-5 virus sample.

Urine will be collected for the following evaluations:

-   -   Routine urinalysis     -   Dipstick for Proteinuria         -   No dose modifications for grade 1/2 events         -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick             4+): Hold bevacizumab treatment until ≦Grade 2, as             determined by either UPC ratio ≦3.5 or 24 hr collection ≦3.5             g         -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab

HEALTH-RELATED QUALITY OF LIFE ASSESSMENTS: EORTC core Quality of Life Questionnaire (QLQ-C30) and a Brain Cancer Module (BCM20) will be completed prior to receiving treatment.

RANDOMIZATION: Patients meeting all of the entry criteria will be randomized to one of two treatment groups in a 1:1 ratio, respectively, using a centralized randomization procedure: (1) VB-111 1×10¹³ VPs monotherapy every 8 weeks followed by, upon progression, VB-111 every 8 weeks and bevacizumab 10 mg/kg every 2 weeks or (2) Bevacizumab monotherapy: 10 mg/kg every 2 weeks. Randomization will be stratified according to age at randomization (≦60 years, <60 years), KPS (<80, ≧80) and progression (1^(st) progression, 2^(nd) progression).

VITAL SIGNS: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

PROPHYLACTIC TREATMENTS: VB-111 RANDOMIZED PATIENTS: For patients randomized to the VB-111 treatment arm, the following prophylactic treatments will be administered:

ANTI-PYRETIC TREATMENT: To avoid fever following study drug administration, prior to treatment with VB-111 only all patients will receive 1000 mg of acetaminophen starting 1-2 hours prior to dosing followed by 500 mg PRN 24 hours.

CORTICOSTEROID TREATMENT: To reduce potential edema response during drug administration, dexamethasone treatment will be administered prior to treatment with VB-111 only:

Initial dose with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 14 days post dosing.

Subsequent doses with VB-111: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion.

If patients begin the study already on steroids, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

Study Drug Administration:

VB-111: Prior to infusion, the solution for injection should be brought to room temperature. Maximum time for drug in saline is 90 minutes at room temperature (60 minutes plus a 30 minute window). The vials should be opened in a biological safety cabinet and combined with saline (see VB-111 Infusion Preparation below). VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, according to the Operations Manual. Specifically, for patients who weigh less than 50 Kg, the dose will be reduced by 30%. A single infusion of VB-111 should be administered at 3 ml/minute. Patients receiving VB-111 should remain in the clinic for 8 hours for observation.

BEVACIZUMAB: To be administered as standard of care (SOC).

VITAL SIGNS: VB-111 RANDOMIZED PATIENTS: The vital signs (systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded at 30 and 60 minutes after dosing and at 4 and 6 hours post dosing, and/or upon disappearance of any adverse event, whichever comes first.

ADVERSE EVENTS: Patients will be monitored for adverse events through their observation following treatment at the clinic.

CONCOMITANT MEDICATIONS: Any concomitant medications administered during the patients' observation following treatment should be recorded.

Vb-111 Monotherapy Follow Up Visits Safety Telephone Contact Every Other Month in Between Dosing Visits (Days 28, 84, 140, etc.)

A telephone call should be made every other month in between dosing visits (days 28, 84, 140, etc.) to the subject/patient to inquire about AEs and changes in medication.

Further VB-111 Administration (Every 8 Weeks Following Initial Dose: Day 56, Day 112, Day 168, Etc.)

On the day of admission to the site, each subject/patient will be re-verified for eligibility according to inclusion/exclusion criteria (where applicable) and then tested within 24 hours prior to dosing. Patients without evidence of progressive disease will be considered for further dosing. This visit and VB-111 dosing will be repeated every 8 weeks until disease progression.

The following assessments will be performed:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since the last visit.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since the last visit.

HEALTH-RELATED QUALITY OF LIFE ASSESSMENTS: EORTC core Quality of Life Questionnaire (QLQ-C30) and a Brain Cancer Module (BCM20) will be completed prior to receiving treatment.

TUMOR MEASURE: Patients will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria. MRI imaging will be done up to 72 hours prior to dosing to assess the extent of cancer. (If the patient has confirmed disease progression, the patient should be considered for participation in the combination therapy with VB-111 and bevacizumab. VB-111 1×10¹³ VPs will be administered every 8 weeks and bevacizumab will be administered every 2 weeks.)

PHYSICAL EXAM: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; or Neurologic.

ECG (Day 168 and Early Termination Only): A standard 12-lead electrocardiogram with rhythm strip should be performed.

LABORATORY ANALYSES:

Blood samples will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT;     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Serum pregnancy test     -   Antibody to the Ad-5 virus sample.

Urine will be collected for the following evaluations:

-   -   Routine urinalysis     -   Dipstick for Proteinuria         -   No dose modifications for grade 1/2 events         -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick             4+): Hold bevacizumab treatment until ≦Grade 2, as             determined by either UPC ratio ≦3.5 or 24 hr collection ≦3.5             g         -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab

VITAL SIGNS: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

ANTI-PYRETIC TREATMENT: To avoid fever following study drug administration, prior to treatment with VB-111 all patients will receive 1000 mg of acetaminophen 1-2 hours prior to dosing followed by 500 mg every 4 hours for 24 hours.

CORTICOSTEROID TREATMENT: To reduce potential edema response during drug administration, prior to treatment with VB-111 dexamethasone treatment will be administered: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion.

If the patient is on steroids at the time of dosing, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

STUDY DRUG ADMINISTRATION: Infusion will be done according to the operation manual. Prior to infusion, the saline should be brought to room temperature. The vials should be opened in a biological safety cabinet and injected into normal saline for infusion according to the operation manual (see VB-111 Infusion Preparation) below. The final solution for administration should be administrated not more than 90 minutes after preparation (60 minutes plus a 30 minute window). VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, as detailed in the Operations Manual. For patients less than 50 Kg of weight, the dose of 1×10¹³ VPs will be reduced by 30%. The intravenous infusions of diluted VB-111 should be administered at 3 mL/minute

A regular meal will be allowed 0.5 hour after dosing.

ADVERSE EVENTS: Patients will be monitored for adverse events through their observation following treatment at the clinic.

CONCOMITANT MEDICATIONS: Any concomitant medications administered during the patients' observation following treatment should be recorded.

End of VB-111 Monotherapy Upon Disease Progression

Patients will continue to receive VB-111 every 8 weeks provided that they continue to be stable. Once patients experience disease progression, they will return to the clinic for a final study visit. In addition, if patients withdraw consent or it is determined by the Investigator that the patient should not continue in the study, the patient will return for an Early Termination Visit. Patients will be contacted by telephone every 2-3 months to follow up on survival.

VB-111+Bevacizumab Administration as Combination Treatment

At the time the patient experiences disease progression, the subject/patient will initiate treatment with VB-111 and bevacizumab as a combination therapy. VB-111 1×10¹³ VPs will be administered every 8 weeks and bevacizumab will be administered every 2 weeks.

Since a minimum of 8 weeks is required between doses of VB-111, if a subject/patient progresses before 8 weeks, the subject will begin treatment with bevacizumab (10 mg/kg) every 2 weeks and at 8 weeks from the last dose of VB-111, the subject/patient will receive the first combination dose with VB-111.

Patients will be re-informed of the advantages, risks and constraints of the combination therapy. The following assessments will be performed on each day of combination treatment:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since the last visit.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since the last visit.

HEALTH-RELATED QUALITY OF LIFE AND NEUROCOGNITIVE FUNCTION: EORTC core Quality of Life Questionnaire (QLQ-C30) and a Brain Cancer Module (BCM20) will be completed prior to receiving treatment.

TUMOR MEASURE: Patients will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria. MRI imaging will be done up to 72 hours prior to dosing to assess extent of cancer.

PHYSICAL EXAM: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; or Neurologic

VITAL SIGNS: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

ECG (to be performed every 6 months from the initial combination dose): A standard 12-lead electrocardiogram with rhythm strip should be performed.

LABORATORY ANALYSES:

Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT;     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Serum pregnancy test;     -   Antibody to the Ad-5 virus sample.

Urine will be collected for the following evaluations:

-   -   Routine urine analysis     -   Dipstick for Proteinuria         -   No dose modifications for grade 1/2 events         -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick             4+): Hold bevacizumab treatment until ≦Grade 2, as             determined by either UPC ratio ≦3.5 or 24 hr collection ≦3.5             g         -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab

ANTI-PYRETIC TREATMENT: To avoid fever following study drug administration, prior to treatment with VB-111 all patients will receive 1000 mg of acetaminophen 1-2 hours prior to dosing followed by 500 mg every 4 hours for 24 hours.

CORTICOSTEROID TREATMENT: To reduce potential edema response during drug administration, prior to treatment with VB-111 dexamethasone treatment will be administered: 10 mg will be administered 30 minutes prior to dosing, followed by 4 mg×2/day for 3 days post dosing. Further corticosteroid treatment will be administered at Investigator's discretion.

If the patient is on steroids at the time of dosing, all efforts should be made by the Investigator not to change the steroid dose within 5 days of disease assessment, unless clinically warranted. A decision to continue the steroids or to begin tapering after this period of time is at the discretion of the Investigator.

BEVACIZUMAB ADMINISTRATION: Bevacizumab will be administered by infusion at a dose of 10 mg/kg before VB-111 on dosing days. The rate of infusion shall be according to the package insert for bevacizumab: Bevacizumab should be delivered over 60 minutes (+30 minute window) as an IV infusion. If the 60-minute infusion is tolerated, all subsequent infusions may be administered over 30 minutes.

VB-111 ADMINISTRATION: Infusion will be done according to the operation manual. Prior to infusion, the saline should be brought to room temperature. The vials should be opened in a biological safety cabinet and injected into normal saline for infusion according to the operation manual (see VB-111 Infusion Preparation below). The final solution for administration should be administrated not more than 90 minutes after preparation (60 minutes plus a 30 minute window). VB-111 will be infused to the patient at the relevant dosage according to the patient's weight, as detailed in the Operations Manual. For patients less than 50 Kg of weight, the dose of 1×10¹³ VPs will be reduced by 30%. The intravenous infusions of diluted VB-111 should be administered at 3 mL/minute.

VITAL SIGNS: For the initial combination dose, vital signs (systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded at 30 and 60 minutes after dosing and at 4 and 6 hours post dosing, and/or upon disappearance of any adverse event, whichever comes first. For further doses, vital signs should be recorded 15 minutes prior to dosing and 30 minutes following dosing

ADVERSE EVENTS: Patients will be monitored for adverse events through their observation following treatment at the clinic.

CONCOMITANT MEDICATIONS: Any concomitant medications administered during the patients' observation following treatment should be recorded.

Follow Up: Combination Treatment with VB-111 and Bevacizumab: Bi-Weekly Treatment with Bevacizumab

Bevacizumab will be administered according to standard of care practices every 2 weeks. It is preferred that the subject/patient visit the study clinic to receive this treatment and be seen by the Investigator to assess safety (via collection of adverse event and concomitant medication information). However, if the subject/patient lives more than 1 hour commute from the clinic, the subject/patient may receive this treatment from his/her local oncologist and safety information (collection of adverse event and concomitant medication information) should be transferred to the study clinic for inclusion into study records. Local visits should be pre-approved by the Medical Monitor on a per patient basis.

Days Following Initial Combination Treatment

One month following the initial combination treatment, each patient will be required to return to the clinic in a fasting state, for the following evaluations:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since the last visit.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since the last visit.

VITAL SIGNS: Vital signs (supine systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

LABORATORY ANALYSES:

Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT, and activated PTT     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin     -   Antibody to the Ad-5 virus sample.

Laboratory samples drawn in response to a clinically significant event will be documented as unscheduled laboratory evaluations.

Urine sample will be collected for the following evaluations:

-   -   Routine urinalysis     -   Dipstick for Proteinuria     -   No dose modifications for grade 1/2 events     -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick         4+): Hold bevacizumab treatment until ≦Grade 2, as determined by         either UPC ratio ≦3.5 or 24 hr collection ≦3.5 g     -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab         Study Therapy Termination: Combination Treatment with VB-111 and         Bevacizumab

Patients will continue to receive VB-111 every 8 weeks and bevacizumab every 2 weeks, provided that they continue to be stable. Visits will continue on days of combination treatment (every 8 weeks). Once patients experience disease progression, they will return to the clinic for a final study visit (see below). In addition, if patients withdraw consent or it is determined by the Investigator that the patient should not continue in the study, the patients will return for a final study visit. Patients will be contacted every 2-3 months to follow up on survival.

Follow up will continue until the patient expires.

Bevacizumab Administration as Monotherapy

Bi-Weekly Treatment with Bevacizumab (Days 14, 28, 42 . . . 70, 84, 98, Etc.)

BEVACIZUMAB ADMINISTRATION: Bevacizumab will be administered biweekly by infusion at a dose of 10 mg/kg according to standard of care practices. During the visits to the clinic to receive this treatment, the subject/patient should be seen by the Investigator to assess safety.

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since signing the consent form.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since signing the consent form.

Bevacizumab Treatment (Days 56, 112, 168, Etc.)

The following assessments will be performed:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since the last visit.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since the last visit.

HEALTH-RELATED QUALITY OF LIFE: EORTC core Quality of Life Questionnaire (QLQ-C30) and a Brain Cancer Module (BCM20) will be completed at each visit prior to receiving treatment.

TUMOR MEASURE: Patients will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria. MRI imaging will be done up to 72 hours prior to dosing to assess extent of cancer.

PHYSICAL EXAM: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; or Neurologic.

ECG (to be performed 6 months from the initial bevacizumab dose): A standard 12-lead electrocardiogram with rhythm strip should be performed.

LABORATORY ANALYSES (according to the operation manual):

Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT;     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Serum pregnancy test     -   Antibody to the Ad-5 virus sample.

Urine will be collected for the following evaluations:

-   -   Routine urine analysis     -   Dipstick for proteinuria         -   No dose modifications for grade 1/2 events         -   Grade 3—(UPC>3.5, urine collection >3.5 g/24 hr, or dipstick             4+): Hold bevacizumab treatment until ≦Grade 2, as             determined by either UPC ratio ≦3.5 or 24 hr collection ≦3.5             g         -   Grade 4 (nephrotic syndrome): Discontinue bevacizumab

VITAL SIGNS: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded 15 minutes prior to dosing.

BEVACIZUMAB ADMINISTRATION: Bevacizumab will be administered by infusion at a dose of 10 mg/kg before VB-111 on dosing days. The rate of infusion shall be according to the package insert for bevacizumab: The initial bevacizumab dose should be delivered over 60 minutes (+30 minute window) as an IV infusion.

Study Completion/Early Termination: Monotherapy with Bevacizumab:

Patients will continue to receive bevacizumab every 2 weeks, provided that they continue to be stable. Visits will continue every 8 weeks. Once patients experience disease progression, they will return to the clinic for a final study visit (see Section 4.5). In addition, if patients withdraw consent or it is determined by the Investigator that the patient should not continue in the study, the patient will return for a final visit.

Patients will be contacted every 2-3 months to follow up on survival.

Follow up will continue until the patient expires.

Study Therapy Termination (all Therapies)

At the time the subject/patient has been withdrawn from the trial, due to consent withdrawal or disease progression the following assessments will be performed as a final study visit:

ADVERSE EVENTS: Patients will be asked about changes in their physical and mental status since the last visit.

CONCOMITANT MEDICATIONS: Patients will be asked about changes in their therapies since the last visit.

HEALTH-RELATED QUALITY OF LIFE AND NEUROCOGNITIVE FUNCTION: EORTC core Quality of Life Questionnaire (QLQ-C30) and a Brain Cancer Module (BCM20) will be completed.

TUMOR MEASURE Patients will be assessed for response using contrast and non-contrast brain magnetic resonance imaging (MRI) with assessment based on the RANO criteria.

PHYSICAL EXAM: Physical Examination will focus on tumor organs and tumor measurements, according to RANO criteria, as well as the following: Head and neck; Eyes; Lungs; Heart; Abdomen; Joints; Peripheral circulation; Skin; or Neurologic

ECG: A standard 12-lead electrocardiogram with rhythm strip should be performed.

LABORATORY ANALYSES:

Blood sample will be collected for the following evaluations:

-   -   Hematology: hemoglobin, complete blood count with differential,         INR, PT and activated PTT     -   Chemistry: electrolytes, creatinine and blood urea nitrogen,         bilirubin, alkaline phosphatase, ALT and AST, calcium, total         protein and albumin;     -   Serum pregnancy test     -   Antibody to the Ad-5 virus sample.

Urine will be collected for the following evaluations:

-   -   Routine urine analysis     -   Dipstick for Proteinuria

VITAL SIGNS: Vital signs (supine, systolic and diastolic blood pressure, peripheral heart rate, body temperature, respiration rate) will be recorded.

Duration of Study

The patients will remain in the study until discontinuation due to disease progression or early termination. Thereafter, the patient will be contacted by telephone survival data every 2-3 months until the patient expires.

Correlative/Special Studies Antibodies

Serum samples will be collected for analysis of levels of antibodies to the adenovirus.

Measurement of Effect Overall Survival

Overall survival is defined as the time from first dose of study medication until death from any cause. Patients will be followed for survival status after completion or removal from the study for progression or toxicity.

Tumor Measurement:

Tumor response will be assessed using the same criteria described in Example 2.

Guidelines for Evaluation of Measurable Disease:

The Guidelines described in Example 2 will be followed.

Response Criteria:

Response criteria will be assessed using the same criteria described in Example 2.

Confirmatory Measurement/Duration of Response

Confirmation:

To be assigned a status of PR or CR, changes in tumor measurements must be confirmed by repeat assessments that should be performed 4 weeks after the criteria for response are first met.

Duration of Overall Response:

The duration of overall response is measured from the time measurement criteria are met for CR or PR (whichever is first recorded) until the first date that recurrent or progressive disease is objectively documented (taking as reference for progressive disease the smallest measurements recorded since the treatment started).

The duration of overall CR is measured from the time measurement criteria are first met for CR until the first date that recurrent disease is objectively documented.

Duration of Stable Disease:

Stable disease is measured from the start of the treatment until the criteria for progression are met, taking as reference the smallest measurements recorded since the treatment started.

Exploratory Assessments

Optional Biopsy Samples:

Biopsies of brain tissue (preferably fresh frozen samples) may be collected for further testing by VBL as part of a clinically indicated procedure at any time in the study. If a sample of brain tissue is collected, a blood sample for transgene analysis should be collected on the same day.

Statistical Considerations Study Design

Objectives:

To evaluate the safety, tolerability and efficacy of multiple doses of VB-111 1×10¹³ viral particles [VPs] Q2 months as monotherapy, combined with bevacizumab 10 mg/Kg every 2 weeks upon progression compared to bevacizumab monotherapy in patients with recurrent GBM.

All data collected will be summarized and presented. Continuous variables will be described as the mean, median, standard deviation and range of n observations. Categorical data will be described with contingency tables including frequency and percentage. Individual subject/patient listings will be generated and presented.

All patients meeting the eligibility criteria who signed a consent form and have received VB-111 and/or bevacizumab will be considered evaluable for safety and efficacy analysis.

Statistical descriptions and analyses will be carried out using SAS statistical analysis software (SAS Institute, Inc., Cary, N.C., USA).

Study Endpoints

Primary Efficacy Endpoint:

Overall Survival (OS), is defined as the time from first dose of study medication until death from any cause. Patients will be followed for survival status after completion or removal from the study for progression or toxicity.

Secondary Efficacy Endpoints:

Progression Free Survival (PFS) is defined as the time from first dose of study medication until objective tumor progression, assessed according to RANO. Tumor response is measured by RANO Criteria including complete response, partial response, stable disease and progression.

Tertiary Efficacy Endpoints:

Tumor growth rate is defined by the rate of change (slope) of tumor size in each subject/patient. Tumor size will be determined as the product of the perpendicular dimensions of the tumor.

Health-Related Quality of Life and Neurocognitive Function [EORTC core Quality of Life Questionnaire (QLQ-C30) and Brain Cancer Module (BCM20)]

Safety and Tolerability Endpoints: adverse events, vital signs, physical examinations, laboratory evaluations, and electrocardiogram (ECG).

Statistical Methods

All data collected will be summarized and presented. Continuous variables will be described as the mean, median, standard deviation, minimum and maximum. Categorical data will be described with contingency tables including frequency and percentage. Individual subject/patient listings of all data will be generated and presented.

Statistical descriptions and analyses will be carried out using SAS statistical analysis software (SAS Institute, Inc., Cary, N.C., USA).

Study Populations

The intention to treat population (ITT) will include all patients meeting the eligibility criteria who have signed a consent form and have received VB-111 will be considered evaluable for safety and efficacy analyses.

In one aspect, efficacy analyses will also be completed in a Per-Protocol population. These analyses will be exploratory and will be defined in the Statistical Analysis Plan.

In another aspect, all patients who received at least one repeat dose of 1×10¹³ VPs of VB-111 will be considered evaluable and included in all efficacy analyses.

Demographic and Baseline Parameters

Demographic and baseline parameters including sex, age, height and weight, details of initial diagnosis and treatment history will be summarized overall and by treatment group. Stratification parameters including age 60 years, >60 years), KPS (<80, 80), and progression history (1^(st) progression, 2^(nd) progression) will be summarized overall by treatment group. All continuous variables will be summarized by descriptive statistics. All discrete variables will be summarized by frequencies and percentages.

Study Duration and Compliance

All study drug administration and compliance data will be summarized.

Prior and Concomitant Medication

All relevant prior medication and all concomitant medications will be summarized by frequencies and percentages. All medications will be coded using the World Health Organization (WHO) drug dictionary.

Efficacy Analyses Primary Efficacy Analysis

Overall survival rates including median survival time and 12 month survival rate will be estimated using the Kaplan-Meier method. OS will be measured from the time of the first dose until death or until the last known date on which the patient was alive. Patients will be followed for survival status after completion or removal from the study for progression or toxicity until death. For patients who have not died at the time of analysis, survival data will be censored at the patient's last known alive date. The log rank test will be used to compare the survival distributions of the two treatment groups. In another aspect, the Cox Regression model with the stratification variables as adjusting covariates will be used to compare the survival distributions of the two treatment groups.

Secondary Efficacy Analyses

Progression free survival rates will be estimated using the Kaplan-Meir method. PFS will be measured from the time of the first dose to the date of first progression or death or until the last known date on which the patient was stable. Patients will be followed for progression status after completion of the study. The log rank test will be used to compare the survival distributions of the two treatment groups. In another aspect, the Cox Regression model with the stratification variables as adjusting covariates will be used to compare the survival distributions of the two treatment groups.

Tumor response will be assessed every 2 months until disease progression. The proportion of patients who had complete response, partial response, stable disease and progression will be summarized at each visit by treatment group. Differences between the proportions in each group will be tested using a Chi Square test. In another aspect, differences between the proportions in each group will be tested using a Cochran Mantel Haenszel (CMH) test controlling for age, KPS, and progression history.

Tertiary Efficacy Analyses

Tumor measurements will be taken every 2 months until disease progression. Tumor growth rate will be determined by calculating the change and percent change from baseline of the tumor size at each visit. The rate of change (slope) of each patient will be calculated and summarized by treatment group. The difference in log transformed tumor growth rate will be compared between the treatment group using the 2 sample T test or Wilcoxon non parametric test, as appropriate.

Subgroup Analyses

Subgroup analysis for the primary and secondary efficacy endpoints will be performed for the following categories:

-   -   Age (≦60, >60);     -   KPR (<80, ≧80);     -   First or second disease progression;     -   Residual tumor size post the initial surgical resection (cutoff         will be determined prior to study unblinding);     -   Tumor size at study enrollment (cutoff will be determined prior         to study unblinding);     -   MGMT mutation status;     -   Gender     -   Country

The detailed definitions of the subgroup analyses will be outlined in the statistical analysis plan. The approach to inference will be a conservative one, based on interactions between treatment group and subgroup category, and adjusting for multiple comparisons.

Safety and Toxicity Analyses

Adverse events monitoring and clinical findings including physical examinations, vital signs, laboratory test results, concomitant medications, and withdrawals/terminations will be used to assess safety.

Adverse Events

AEs will be categorized by SOC and Preferred Terms using the MedDRA dictionary. The incidence of AEs as well as the severity and relationship to study drug will be presented by treatment group. The incidence of AEs leading to withdrawal from the study and serious AEs (SAES) will be summarized by frequency and percentages.

As per NCI CTCAE Version 4.0, the term toxicity is defined as adverse events that are classified as either possibly, probably, or definitely related to study treatment. The maximum grade for each type of toxicity will be recorded for each patient and will be used for reporting. Frequency tables will be reviewed to determine toxicity patterns. In addition, all adverse event data graded as 3, 4, or 5 and classified as either “unrelated or unlikely to be related” to study treatment in the event of an actual relationship developing will be reviewed.

Serious adverse events will be similarly summarized.

Infusional adverse events will also be summarized by both the investigator's and the sponsor's assessment of causality.

Clinical findings will include evaluation of physical examinations, vital signs and laboratory test results, concomitant medications, and withdrawals/terminations. These findings will be summarized by treatment group. Continuous variables will be described as the mean, median, standard deviation, and range of n observations. Categorical data will be described with contingency tables including frequency and percent.

Interim Analysis

A Data and Safety Monitoring Committee (DSMC) will be appointed to review the data on safety and efficacy as they accumulate.

Data on adverse outcomes will be reviewed on an ongoing basis. The committee will meet at regular intervals to be agreed upon by the members of the committee and the sponsor.

The final analysis of the results will be conducted after all patients have been followed for at least 12 months. A single formal interim analysis will be conducted 8 months before the planned final analysis, when it is calculated that 60% of the expected total number of events will have accrued. The statistical guideline for the committee to recommend early termination of the trial due to efficacy/futility will be based on attainment of a statistically significant difference in the direction of benefit to VBL-111 at the two-sided 0.003 level.

Under the stopping rule, computer simulations show that in order to preserve the overall two-sided 0.05 level, the final analysis should use a two-sided 0.0493 level instead of 0.05.

In another aspect, the statistical guideline for the committee to recommend early termination of the trial due to efficacy/futility will be based on the conditional probability (under the alternative hypothesis) of attaining a statistically significant result at the end of the trial being less than 0.05. Under this futility stopping rule, the significance level of the final analysis will remain at the two-sided level of 0.05, because futility analyses do not increase the probability of a type I error in the direction of advantage to the experimental treatment.

At the time of this interim analysis, the Data and Safety Monitoring Committee will provide the sponsor with the estimated Kaplan-Meir survival curves for the two treatment groups together with the estimated hazard ratio and two-sided p-value for the comparison.

Power and Significance Level

The trial is planned to enroll 252 subjects/patients, who will be randomized to VB-111 vs. bevacizumab, at a 1:1 ratio. See FIG. 1. The final analysis of the results will be conducted after all patients have been followed for at least 12 months. The expected number of deaths that will have been observed at that time is 151, under the assumption that recruitment of all patients will be achieved at a uniform rate over 12 months. If recruitment takes longer than 12 moths or recruitment rates, instead of being uniform, increase as the trial proceeds, then the expected number of deaths will be larger than 151. The sample size justification is described below:

Assuming a proportional hazards model, the hazard ratio is calculated as the ratio of the logarithms of the survival rates (at any time). Assuming a 37.6% 12 month survival rate in the bevacizumab treatment group (based on bevacizumab study) and a 55% 12 month survival rate in the VB-111 group (based on the 12 patients treated at high dose of VB-111 reported above), the hazard ratio λ=ln(0.55)/ln(0.376)=0.611.

It is expected that this study will recruit patients for 12 months and then follow up for 12 months.

A single formal interim analysis will be conducted after 60% of the expected total number of events will have accrued. In order to preserve an overall two-sided 0.05 significance level, the final analysis will use a two-sided 0.0493 level instead of 0.05. Based on the bevacizumab study and, where necessary, on exponential decay extrapolations, the percentage of deaths observed in the bevacizumab group is expected to be 75.4%. Given the hazard ratio of 0.611, the percentage of deaths observed in the VB-111 group is expected to be 58%.

The final analysis will compare the survival curves of bevacizumab versus VB-111 using the Logrank Test. In order to calculate the required sample size, the following formula was used:

$\begin{matrix} {{\frac{1}{d_{1}} + \frac{1}{d_{2}}} = \frac{\left( {\ln \mspace{11mu} \lambda} \right)^{2}}{\left( {z_{\alpha} + z_{\beta}} \right)^{2}}} & (1) \end{matrix}$

where d₁=number of deaths observed in VB-111 group d₂=number of deaths observed in the bevacizumab group λ=assumed hazard ratio=0.611 z_(β)=standard normal deviate for two-sided significance level of 4.93% (adjusted for the interim analysis to preserve the overall 5% level)=1.966 z_(β)=standard normal deviate for statistical power of 85%=1.0364

Given:

d₁=p₁×n₁, where n₁ is the sample size in the VB-111 group; d₂=p₂×n₂, where n₂ is the sample size in the bevacizumab group; p₁=overall proportion of deaths expected to be observed in the VB-111 group=0.58; p₂=overall proportion of deaths expected to be observed in the bevacizumab group=0.754; and n₁=n₂ Solve formula (1) for n₁ and n₂. These numbers were divided by 0.9 to account for a 10% drop-out rate.

Based on the assumptions above, a sample size of 126 patients in the bevacizumab group and 126 patients in the VB-111 group, giving a total of 252 patients will be required. (FIG. 1).

VB-111 Infusion Preparation

Drug Description

Study drug vials will be supplied for each patient in labeled 1.8 ml cryovials (polypropylene) or 10 ml borosilicate vials. Each cryovial contains a volume of 1.1 ml (1012 VP/ml). Each borosilicate vial contains a volume of 5.3 ml (1012 VP/ml). The drug will be stored in the pharmacy at or below −65° C. The patient information (Patient number, Visit Date) should be added by hand to the label using a permanent ink marker and recorded in the patient records.

Procedure Prior to Infusion

The entire process of drug preparation shall be carried out at room temperature in the BSC type II room. After thawing, the drug may be maintained up to 3 hours in ice water during preparations. The drug is diluted in room temperature saline. The preparation of the drug and drug injection shall be completed within 1 hour, with a window of 30 minutes (for a maximum time of 90 minutes).

The pharmacist preparing the drug shall verify that the information on the container is appropriate for the study and for the patient: product name, concentration, batch number.

For each patient, use the appropriate syringe as specified in Table 9. Place volume needed of saline (brought to room temperature) in a 50 ml sterile plastic tube. Thaw the vials of VB-111 solution by rubbing between the gloved hands. Be sure to mark the time of thaw.

Using a 10 ml syringe, pull 1 ml of VB-111 from each of the cryovial or 5 ml from the borosilicate vial intended for the specific patient. Add VB-111 to the plastic tube containing the saline solution prepared in advance. Draw the piston to mix the remaining VB-111 in the syringe with saline and push it back into the plastic tube. Mix the diluted drug by swirling the contents by hand. Determine the volume to be applied according to the patient's weight and draw the required volume for injection into the syringe for administration.

After completing the preparation, perform a reconciliation process: check that the correct number of source vials was used; and record vials assigned to the patient in the drug accountability log.

After preparation of the drug solution, clean the drug formulation area in the pharmacy according to the pharmacy procedures.

VB-111 Infusion

Patients should receive VB-111 in a fasting state. “A fasting state” means that the patient has had nothing to eat or drink for at least the previous 2 hours.

A single intravenous infusion of the diluted VB-111 should be administered according to the instructions below at 3 ml/minute.

An infusion pump may be used. A regular meal may be provided to the patient 30 minutes after completion of dosing. On dosing days where the patient is treated with both VB-111 and bevacizumab, bevacizumab shall be prepared and dosed prior to VB-111.

TABLE 9 VB-111 Preparation Dose 1 ×10¹³ 1 × 10¹³ Concentration in vial (VP/ml) 10¹²  10¹² Volume of VB-111 in tube 1.1 ml 5.3 ml  # Vials of VB-111 10  2 Take this volume of VB-111 10 × 1 ml    2 × 5 ml   Syringe Type for VB-111 10 ml 10 ml Volume of saline 40 ml 40 ml Tube type for saline  50 ml*  50 ml* Total volume prepared 50 ml 50 ml Volume to inject patient weight Entire volume Entire volume ≧50 kg (50 ml) (50 ml) Volume to inject patient weight  35 ml**  35** <50 kg *The pharmacy may alternatively use a sterile empty bag and add 40 ml NS + 10 ml VB-111 to the bag, or the pharmacy can use a 50 ml bag of NS and remove the excess volume then add the VB-111. Either way is an acceptable pharmacy practice. **35 ml for patients <50 kg represents a 30% reduction of VB-111 mixed with saline, in accordance with the Protocol, “Study Drug Administration.”

The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying knowledge within the skill of the art, readily modify and/or adapt for various applications such specific embodiments, without undue experimentation, without departing from the general concept of the present invention. Therefore, such adaptations and modifications are intended to be within the meaning and range of equivalents of the disclosed embodiments, based on the teaching and guidance presented herein. It is to be understood that the phraseology or terminology herein is for the purpose of description and not of limitation, such that the terminology or phraseology of the present specification is to be interpreted by the skilled artisan in light of the teachings and guidance.

The present application claims priority to U.S. provisional Application No. 61/760,601, filed Feb. 4, 2013, U.S. provisional Application No. 61/800,716, filed Mar. 15, 2013; U.S. provisional Application No. 61/858,467, filed Jul. 25, 2013; and U.S. provisional Application No. 61/907,286, filed Nov. 21, 2013, all of which are incorporated herein by reference in their entireties. 

1. A method for inducing or improving responsiveness to a vascular endothelial growth factor (VEGF) antagonist in a subject in need thereof, comprising administering a vector which comprises a Fas-chimera gene operably linked to an endothelial cell specific promoter, and the VEGF antagonist to the subject, wherein the responsiveness to the VEGF antagonist is induced or improved after the administration of the vector compared to the responsiveness to the VEGF antagonist without the administration of the vector. 2-4. (canceled)
 5. The method of claim 1, wherein the responsiveness to the VEGF antagonist is an anti-angiogenesis property of the VEGF antagonist.
 6. The method of claim 1, wherein the responsiveness to the VEGF antagonist is an anti-tumor effect of the VEGF antagonist.
 7. The method of claim 1, wherein the VEGF antagonist is an anti-VEGF antibody or a VEGF binding molecule.
 8. The method of claim 7, wherein the anti-VEGF antibody is a monoclonal antibody, a humanized antibody, a human antibody, a single chain antibody, or a chimeric antibody.
 9. (canceled)
 10. The method of claim 8, wherein the anti-VEGF antibody is bevacizumab.
 11. The method of claim 1, wherein the Fas-chimera gene product comprises a polypeptide comprising an extracellular domain of a TNF Receptor 1 (TNFR1) polypeptide fused to a transmembrane domain and an intracellular domain of a Fas polypeptide. 12-19. (canceled)
 20. The method of claim 1, wherein the endothelial cell specific promoter is a PPE-1-3X promoter. 21-22. (canceled)
 23. The method of claim 1, wherein the vector and the VEGF antagonist are administered concurrently or sequentially.
 24. (canceled)
 25. The method of claim 1, wherein the vector is administered at an effective amount of at least about 1×10¹¹ virus particles, at least about 1×10¹² virus particles, at least about 1×10¹³ virus particles, or at least about 1×10¹⁴ virus particles.
 26. The method of claim 10, wherein the bevacizumab is administered at an effective amount of less than about 15 mg/kg, 14 mg/kg, 13 mg/kg, 12 mg/kg, 11 mg/kg, 10 mg/kg, 9 mg/kg, 8 mg/kg, 7 mg/kg, 6 mg/kg, 5 mg/kg, 4 mg/kg, 3 mg/kg, 2 mg/kg, or 1 mg/kg.
 27. The method of claim 10, wherein the vector is administered at an effective amount of at least about 1×10¹² to at least about 1×10¹³ virus particles and bevacizumab is administered at an effective amount of 5 mg/kg to 15 mg/kg. 28-29. (canceled)
 30. The method of claim 7, wherein the VEGF antagonist is selected from the group consisting of bevacizumab, ranibizumab, VGX-100, r84, aflibercept, IMC-18F1, IMC-1C11, and ramucirumab. 31-34. (canceled)
 35. The method of claim 10, wherein the vector is repeatedly administered.
 36. The method of claim 35, wherein the vector is repeatedly administered every day, once in about 2 days, once in about 3 days, once in about 4 days, once in about 5 days, once in about 6 days, once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 5 weeks, once in about 6 weeks, once in about 7 weeks, once in about 2 months, or once in about 6 months.
 37. The method of claim 10, wherein the bevacizumab is repeatedly administered.
 38. The method of claim 37, wherein the bevacizumab is repeatedly administered once in about 7 days, once in about 2 weeks, once in about 3 weeks, once in about 4 weeks, once in about 2 months, once in about 3 months, once in about 4 months, once in about 5 months, or once in about 6 months.
 39. The method of claim 10, wherein the vector is repeatedly administered every 2 months and the bevacizumab is repeatedly administered every 2 weeks. 40-41. (canceled)
 42. The method of claim 1, wherein the subject has cancer.
 43. (canceled)
 44. The method of claim 1, wherein the subject has a tumor or a metastasis thereof.
 45. The method of claim 44, wherein the vector and the VEGF antagonist inhibit or reduce the size of the tumor or a metastasis thereof. 46-47. (canceled)
 48. The method of claim 1, wherein the vector comprises, consists of, or consists essentially of SEQ ID NO
 19. 49-50. (canceled)
 51. The method of claim 48, wherein the vector is administered at an effective amount of about 1×10¹¹, about 1×10¹², about 1×10¹³, or about 1×10¹⁴ virus particles. 